bigram

This is a table of type bigram and their frequencies. Use it to search & browse the list to learn more about your study carrel.

bigram	frequency
solar system	986
milky way	518
let us	432
heavenly bodies	415
naked eye	406
one hundred	320
fixed stars	304
years ago	301
double stars	279
sir william	249
per second	226
two stars	218
one side	209
full moon	207
new york	204
one another	202
thousand miles	198
sir john	191
million miles	188
two hundred	185
miles per	183
celestial sphere	182
william herschel	178
four hours	175
royal society	168
new star	168
total eclipse	167
john herschel	164
three hundred	164
many years	162
thousand years	158
magnitude star	158
southern hemisphere	156
three years	156
hundred years	155
astronomer royal	154
take place	152
shooting stars	151
hundred miles	151
first magnitude	149
straight line	148
much less	148
minor planets	148
solar spectrum	147
north pole	146
first place	145
years later	142
present day	139
cubic miles	138
zodiacal light	138
pole star	136
great bear	133
double star	133
centrifugal force	133
much greater	132
le verrier	130
de la	129
crown vo	127
per cent	127
took place	126
mean distance	125
present time	122
two bodies	120
right angles	120
nebular hypothesis	118
northern hemisphere	117
tells us	115
new moon	114
bright stars	114
united states	111
every one	111
great nebula	111
comptes rendus	110
celestial bodies	109
two years	109
three times	109
well known	108
bright star	108
one time	108
proper motion	107
bright lines	107
variable stars	106
great comet	106
tycho brahe	106
proper motions	105
dark lines	105
long time	105
five years	104
different parts	104
magnifying power	103
inch telescope	102
takes place	97
observations made	96
great circle	95
planetary system	95
right ascension	95
good hope	93
far away	93
copernican system	93
far beyond	92
middle ages	92
four years	92
taken place	91
nineteenth century	91
second magnitude	89
lick observatory	88
powerful telescopes	88
revolve around	88
much larger	88
powerful telescope	88
will see	88
thousand times	87
shall find	87
four times	86
five hundred	85
great number	85
apparent size	84
small stars	84
close together	84
now known	84
astronomical observations	84
new planet	83
mount wilson	83
revolving round	82
south pole	82
great distance	82
shall see	82
one star	81
copernican theory	81
celestial equator	81
will find	81
astronomical society	80
solar eclipse	80
turned towards	80
four hundred	80
alpha centauri	79
focal length	78
royal observatory	78
revolution around	77
long ago	77
periodic time	77
will show	77
great deal	76
sir isaac	76
much light	75
first time	75
many times	75
great pyramid	74
hundred times	74
every part	74
greenwich observatory	74
short time	74
faint stars	74
vernal equinox	74
will appear	73
great work	73
six years	73
two thousand	73
brightest star	72
universal gravitation	72
heavenly body	72
one day	72
mean density	72
fixed star	71
ursa major	71
greater part	71
opposite side	70
square miles	70
opposite direction	70
twenty years	70
one second	70
star clusters	70
one thousand	70
central body	69
enable us	69
reflecting telescope	69
lunar surface	69
feet high	69
ten times	68
left behind	68
unaided eye	68
every year	68
already mentioned	68
nautical almanac	67
many cases	67
even though	67
ptolemaic system	67
either side	66
royal astronomical	66
times less	66
revolving around	66
nebulous matter	66
tell us	66
new stars	66
much smaller	66
million years	65
small telescope	65
relative positions	65
first sight	65
seven days	65
something like	65
celestial objects	64
three days	64
two planets	64
isaac newton	64
revolve round	64
hollow sphere	63
ten years	63
three stars	63
greatest density	63
yerkes observatory	63
times greater	63
solar heat	63
apparent diameter	63
human race	63
thirty years	63
see plate	62
hundred thousand	62
nearly equal	62
stellar universe	62
like manner	62
now know	62
two points	61
hundred feet	61
stellar system	61
cosmic matter	61
white light	61
towards us	61
fifty years	61
two hours	60
great telescope	60
five miles	60
earth must	59
seven years	59
miles away	59
harvard college	59
orion nebula	59
starry heavens	59
variable star	59
fifteen years	59
straight lines	59
six months	59
eight years	58
set forth	58
illustration fig	58
meteoric stones	58
see fig	58
every direction	58
one degree	58
brightest stars	58
small bodies	58
sixth magnitude	58
good deal	57
solar surface	57
lord rosse	57
every day	57
one end	57
british association	57
one direction	56
apparent motion	56
magnitude stars	56
third magnitude	56
line joining	56
us now	56
red spot	56
magnitudes six	55
natural history	55
angular distance	55
transit instrument	55
lunar crater	55
one point	55
solar atmosphere	55
binary stars	55
one half	55
give us	55
two great	55
miles across	55
royal vo	55
never seen	55
years old	54
refracting telescope	54
gives us	54
whole mass	54
sun will	54
miles long	54
modern times	54
inferior conjunction	54
three months	54
nearly circular	54
many others	54
dark body	53
something else	53
greater distance	53
mountain chains	53
taking place	53
revolves around	53
five times	52
much nearer	52
th part	52
inches aperture	52
large enough	52
one may	52
ever since	52
forty years	52
may well	52
one place	52
north america	52
professor young	52
evening star	51
seventeenth century	51
large number	51
weather review	51
stars visible	51
us suppose	51
common centre	51
many millions	51
star cluster	50
may seem	50
tidal friction	50
third law	50
sun must	50
five degrees	50
three hours	50
terrestrial magnetism	50
less dense	50
moon must	50
will take	50
sir david	50
planetary orbits	50
total eclipses	49
photographic plate	49
attractive force	49
original nebula	49
south america	49
several times	49
spectrum analysis	49
monthly weather	49
will probably	49
give rise	49
temporary stars	49
one part	49
one might	48
many stars	48
great discovery	48
totally different	48
large part	48
november meteors	48
enables us	48
first seen	48
dark ring	48
great planet	48
et seq	48
carbonic acid	47
solid matter	47
magnetic needle	47
may say	47
whole earth	47
much like	47
far greater	47
five thousand	47
four days	47
six hundred	47
every star	47
two centuries	47
planetary motions	47
sir george	47
almost every	47
modern astronomy	47
falling stars	46
least one	46
directed towards	46
thousand feet	46
miles high	46
planetary motion	46
one planet	46
outer edge	46
astronomical instruments	46
zodiacal constellations	46
almost exactly	46
stellar parallax	46
small star	46
demy vo	46
last century	46
many thousands	46
present state	45
magnetic field	45
little doubt	45
transit circle	45
already seen	45
human mind	45
may now	45
equatorial regions	45
ten thousand	45
look like	45
first quarter	45
six times	45
inferior planet	45
shows us	44
animal life	44
will give	44
nearest star	44
physical constitution	44
relative distances	44
revolution round	44
astronomical observation	44
practical astronomy	44
foot telescope	44
polar regions	44
one way	44
twenty miles	44
chapter ii	43
various parts	43
multiple stars	43
celestial body	43
solar spots	43
earth around	43
reflected light	43
small part	43
faint star	43
sun spots	43
seven stars	43
orbital motion	43
modern science	43
even now	43
several years	43
outer planets	43
polar caps	43
scientific men	43
christian era	43
thousandth part	43
great astronomer	43
telescopic power	43
solar eclipses	43
reversing layer	42
large telescopes	42
six feet	42
diurnal revolution	42
must therefore	42
sargasso sea	42
northern crown	42
will therefore	42
two days	42
five minutes	42
foot reflector	42
great importance	42
line drawn	42
professor newcomb	41
whole solar	41
inch refractor	41
footnote see	41
four miles	41
radius vector	41
london times	41
eleven years	41
brighter stars	41
average distance	41
feet long	41
eighteenth century	41
high temperature	41
will now	41
aurora borealis	41
chapter iii	40
greek word	40
planet mars	40
easily seen	40
put forward	40
planet saturn	40
stars forming	40
red star	40
quite different	40
summer solstice	40
become visible	40
extra crown	40
andromeda nebula	40
continuous spectrum	40
long period	40
three thousand	40
five days	40
principal stars	40
autumnal equinox	40
parallel lines	39
inner edge	39
see also	39
twelve hours	39
component stars	39
four minutes	39
common center	39
superior planets	39
scientific american	39
natural phenomena	39
attractive power	39
might well	39
earth moves	39
paris observatory	39
four satellites	38
will enable	38
celestial motions	38
polar axis	38
greater number	38
opposite sides	38
de revolutionibus	38
complete revolution	38
will continue	38
chapter iv	38
present century	38
four feet	38
following year	38
little bear	38
apparent movements	38
distance apart	38
sometimes called	38
comparatively small	38
days later	38
volcanic action	38
copernican doctrine	38
must necessarily	38
dark bodies	38
must always	38
recent times	38
leads us	38
six miles	38
globular clusters	37
may also	37
canes venatici	37
th century	37
von buch	37
philosophical transactions	37
cosmical axis	37
total solar	37
short period	37
spiral nebula	37
clear night	37
ten days	37
professor challis	37
temporary star	37
good telescope	37
moon will	37
stars may	37
canis major	37
three miles	37
nothing else	37
spectral lines	37
organic life	37
nova persei	37
object glass	37
long since	37
physical description	36
dry land	36
primum mobile	36
internal heat	36
looked like	36
lunar eclipse	36
celestial phenomena	36
periodic times	36
equal times	36
natural philosophy	36
hundred millions	36
six thousand	36
major axis	36
sixteenth century	36
many centuries	36
little less	36
greatest elongation	36
two months	36
college observatory	36
absolute temperature	36
must also	36
red stars	36
different places	36
must remember	36
whole system	36
sun may	36
another way	36
solar corona	36
nearly three	36
will come	36
fifty miles	35
minor planet	35
recent years	35
tenth magnitude	35
will also	35
great majority	35
square inch	35
important part	35
reach us	35
half times	35
two parts	35
stars appear	35
four stars	35
footnote humboldt	35
different kinds	35
one hand	35
well seen	35
long enough	35
per square	35
may see	35
astronomical work	35
trinity college	35
sir norman	35
great telescopes	35
half years	35
eight minutes	35
still greater	35
de morgan	35
magnitudes five	35
perihelion passage	35
southern cross	35
great planets	35
great circles	35
diurnal motion	35
first discovered	35
next day	34
ninth magnitude	34
hydrogen lines	34
near enough	34
know nothing	34
four thousand	34
chemical elements	34
axial rotation	34
anything else	34
nine years	34
telescope will	34
centuries ago	34
fourth magnitude	34
ninety degrees	34
eastern horizon	34
william huggins	34
reader will	33
distant objects	33
seventh magnitude	33
planet venus	33
north latitude	33
around us	33
every point	33
minute stars	33
larger planets	33
different periods	33
stars whose	33
high degree	33
mean time	33
great difficulty	33
several hundred	33
great interest	33
planet jupiter	33
every night	33
base line	33
solid body	33
nearly half	33
one third	33
mutual attraction	33
stars will	33
one thing	32
different times	32
half hours	32
much longer	32
living creatures	32
small planets	32
inch glass	32
professor pickering	32
sir robert	32
french astronomer	32
go back	32
human eye	32
solar parallax	32
solar nebula	32
visible universe	32
planet must	32
magnifying powers	32
winter solstice	32
ever seen	32
sixty miles	32
holy office	32
long series	32
will always	32
superior conjunction	32
eighth magnitude	32
entirely different	32
lead us	32
six days	32
great part	32
rotary motion	32
eight times	32
ten hours	31
hundred million	31
one year	31
late professor	31
twenty minutes	31
sixty years	31
greenwich time	31
lunar craters	31
may call	31
whole universe	31
circle round	31
relative position	31
eight miles	31
seven miles	31
atmospheric pressure	31
physical science	31
eight days	31
great many	31
passed away	31
thousand stars	31
greatest distance	31
one foot	31
seven times	31
solar disc	31
corona borealis	31
comparatively near	31
inferior planets	31
miles deep	30
smaller ones	30
will never	30
two suns	30
great britain	30
dusky ring	30
dark line	30
equal parts	30
mean temperature	30
interesting objects	30
various planets	30
feet deep	30
bright enough	30
specific gravity	30
perpetual snow	30
unknown planet	30
one occasion	30
many instances	30
equal areas	30
november th	30
spectroscopic binaries	30
mural circle	30
low power	30
absolute zero	30
stellar spectra	30
mean annual	30
opposite directions	30
star will	30
orbit round	30
meridian circle	30
two kinds	30
western horizon	30
thirty miles	30
professor barnard	30
every twenty	30
david gill	29
lick telescope	29
high tide	29
du monde	29
twelve years	29
nineteen years	29
two different	29
individual stars	29
great discoveries	29
ursa minor	29
different planets	29
still remains	29
present condition	29
carried round	29
will make	29
part ii	29
material substance	29
one great	29
ten miles	29
similar manner	29
different distances	29
certain stars	29
radiant point	29
chapter vi	29
century ago	29
question whether	29
lunar theory	29
morning star	29
norman lockyer	29
volcanic activity	29
six hours	29
next year	29
good fortune	29
given rise	29
sidereal system	29
nearly two	29
true nature	29
made use	29
old man	29
due south	29
certain degree	29
best known	29
physical astronomy	29
canis minor	28
eighteen years	28
resisting medium	28
one revolution	28
superior planet	28
astronomical observatory	28
lunar mountains	28
see whether	28
first point	28
looks like	28
stars composing	28
may th	28
solar rays	28
brilliant star	28
astronomical science	28
three different	28
planetary bodies	28
fifth magnitude	28
considerable distance	28
young man	28
planet uranus	28
also called	28
star alpha	28
wilson observatory	28
anything like	28
earth revolves	28
small one	28
photographs taken	28
chapter vii	28
accurate observations	28
fraunhofer lines	28
place among	28
glowing gas	28
two lines	28
three bodies	28
degrees north	28
good reason	28
matter composing	28
already remarked	28
may take	28
glass will	28
magnitudes four	28
celestial vault	28
ring system	27
varies inversely	27
revolves round	27
first step	27
nearly one	27
two hemispheres	27
two inches	27
carried along	27
th magnitude	27
large telescope	27
fixed point	27
seven hundred	27
nebular theory	27
one case	27
et de	27
make one	27
whole heavens	27
magnetic storm	27
inverse square	27
per minute	27
many illustrations	27
might expect	27
miles apart	27
short distance	27
every thing	27
lord kelvin	27
given time	27
two opposite	27
close double	27
great extent	27
certain extent	27
little planet	27
observer will	27
northern heavens	27
several planets	27
mare imbrium	27
reflecting telescopes	27
gamma draconis	27
polar diameter	27
powerful instruments	27
star near	27
apparent motions	27
ancient times	27
gave rise	26
retrograde motion	26
will pass	26
forty miles	26
intimately connected	26
big dipper	26
made known	26
small portion	26
transit room	26
just mentioned	26
solid earth	26
five hours	26
may possibly	26
des sciences	26
motion round	26
far apart	26
solar activity	26
less conspicuous	26
elliptic orbit	26
stars within	26
turned round	26
three feet	26
right hand	26
years previously	26
fainter stars	26
scientific world	26
much farther	26
small fraction	26
nebulous stars	26
one knows	26
earth may	26
chief stars	26
atlantic ocean	26
might almost	26
one million	26
great variety	26
hooker telescope	26
old age	26
first observed	26
hollow centre	26
two satellites	26
two miles	26
new world	26
turned toward	26
inches long	26
earth will	26
two distinct	26
turned away	26
terrestrial paradise	26
brilliant white	26
will become	26
intense heat	26
new observatory	26
northern asia	26
astronomical knowledge	26
come back	26
new zealand	26
yet another	26
generally believed	26
outer ring	26
magellanic clouds	26
perhaps even	26
meteoric masses	25
less brilliant	25
stars near	25
inner half	25
stars must	25
twentieth century	25
must now	25
two observers	25
celestial object	25
shortly afterwards	25
seventy years	25
almost always	25
just described	25
larger star	25
another star	25
mont blanc	25
much better	25
planet mercury	25
many thousand	25
comet appeared	25
still less	25
southern horizon	25
gives rise	25
mutual attractions	25
many miles	25
total number	25
sur la	25
nearest stars	25
six inches	25
lunar atmosphere	25
geographical distribution	25
great problem	25
french academy	25
solar light	25
may appear	25
circular motion	25
torrid zone	25
intimate connection	25
may find	25
million times	25
lunar eclipses	25
multiple star	25
seven degrees	25
partial eclipse	25
monthly notices	25
reflected sunlight	25
like ours	25
two minutes	25
special interest	25
certain amount	25
human intellect	25
magnetic storms	25
now see	25
one body	25
whole surface	25
cosmical bodies	25
close approach	25
whatever may	25
much brighter	25
six minutes	25
two million	25
extremely small	25
different portions	25
brought together	24
fifteenth century	24
great mass	24
toward us	24
first astronomer	24
earth might	24
diurnal rotation	24
nearly four	24
setting sun	24
make use	24
solar disk	24
past ages	24
two classes	24
several days	24
powerful enough	24
planets move	24
already described	24
best seen	24
one inch	24
wide double	24
many months	24
imaginary line	24
upper surface	24
every case	24
meteoric matter	24
binary systems	24
several thousand	24
small circle	24
george airy	24
every reason	24
solar rotation	24
luminous matter	24
far less	24
move round	24
mean distances	24
vertical circle	24
white stars	24
early part	24
little star	24
second law	24
two places	24
little attention	24
chemical composition	24
various kinds	24
will serve	24
may still	24
may therefore	24
heat produced	24
many places	24
central mass	24
sun appears	24
somewhat similar	24
favorable circumstances	24
empty space	24
us see	24
per hour	24
astronomical discoveries	24
large one	24
astronomical research	24
two bright	24
brings us	24
southern fish	24
first made	24
binary system	24
ancient nations	24
planet will	24
annual parallax	24
revolved round	24
upper part	23
equatorial diameter	23
planet neptune	23
every time	23
whole sky	23
upper end	23
central portion	23
daily motion	23
earth rotates	23
planets revolve	23
dark spots	23
thirty feet	23
solid crust	23
luminous body	23
elie de	23
made many	23
central part	23
northern latitudes	23
early days	23
nearest approach	23
telescopic stars	23
often called	23
modern astronomers	23
different degrees	23
spectral type	23
every hour	23
two others	23
annual revolution	23
central sun	23
georgium sidus	23
recent observations	23
highly probable	23
national observatory	23
seven planets	23
much higher	23
put together	23
much time	23
main body	23
concave mirror	23
apparent movement	23
given us	23
may add	23
ring nebula	23
three million	23
nearly twenty	23
go round	23
meteoric shower	23
far back	23
eight thousand	23
us take	23
galileo galilei	23
lunar day	23
grand duke	23
three minutes	23
orbital revolution	23
light reflected	23
angular diameter	23
american museum	23
one particular	23
sun rises	23
every particle	23
long way	23
moon revolves	23
henry draper	23
stony meteorites	23
smaller star	23
already referred	23
recent discoveries	23
miles wide	23
mean diameter	23
almost entirely	23
remarkable fact	23
later years	23
another time	23
may perhaps	22
degrees south	22
high magnifying	22
popular astronomy	22
express train	22
chapter ix	22
earth round	22
must go	22
american astronomer	22
many hundreds	22
five feet	22
good many	22
two forces	22
many different	22
careful study	22
distant stars	22
physical phenomena	22
yet even	22
elliptic path	22
crape ring	22
repulsive force	22
will move	22
left hand	22
forty degrees	22
first law	22
bright ring	22
inch reflector	22
great size	22
mount hamilton	22
way across	22
excessive heat	22
astronomical discovery	22
near together	22
human life	22
many hundred	22
father secchi	22
three inches	22
ten minutes	22
now generally	22
exactly equal	22
first noticed	22
much attention	22
last quarter	22
one quarter	22
conspicuous stars	22
certain distance	22
twenty degrees	22
axial revolution	22
red end	22
photograph taken	22
acid gas	22
may even	22
active volcanoes	22
radial velocities	22
violet rays	22
everything else	22
living things	22
far enough	22
elliptic orbits	22
sharply defined	22
far distant	22
light coming	22
round numbers	22
little stars	22
spring tides	22
coma berenices	22
de beaumont	22
first view	22
revolved around	22
years since	22
volcanic eruptions	22
holy scriptures	22
constantly increasing	22
regular intervals	22
last two	22
southern pole	22
vast number	22
rapid motion	22
infernal regions	22
already known	22
particular star	22
liquid state	21
five planets	21
eighteen miles	21
exceedingly small	21
rapid rotation	21
hot springs	21
one focus	21
two components	21
mare serenitatis	21
large proportion	21
became known	21
yet known	21
curious fact	21
three seconds	21
may suppose	21
different observers	21
coal measures	21
us consider	21
miles broad	21
ages ago	21
spot period	21
binary star	21
whole world	21
many things	21
von humboldt	21
every second	21
four months	21
moon may	21
twenty feet	21
bright line	21
celestial orbs	21
ancient astronomers	21
things seen	21
real existence	21
first observation	21
different seasons	21
annual motion	21
spectroscopic observations	21
farther away	21
near approach	21
cape observatory	21
nearly twice	21
sidereal day	21
telescopic objects	21
average density	21
la place	21
different points	21
greek words	21
half century	21
total phase	21
feet per	21
nebulous mass	21
apparent distance	21
stand still	21
first satellite	21
may look	21
twenty times	21
black rain	21
two feet	21
remained visible	21
two men	21
circular path	21
ptolemaic theory	21
many ages	21
widely separated	21
true one	21
chromatic aberration	21
first discovery	21
already stated	21
latter case	21
great distances	21
opposite points	21
two small	21
south latitude	21
come within	21
yale college	21
much interest	21
magnetic force	21
various ways	21
many astronomers	21
large scale	21
every side	21
shooting star	21
fifty feet	21
generally accepted	20
falling bodies	20
moon passes	20
stars seem	20
diametrically opposite	20
separate stars	20
mutual relations	20
now come	20
moving towards	20
fifty thousand	20
giordano bruno	20
face page	20
must revolve	20
three degrees	20
years afterwards	20
knew nothing	20
near one	20
great globe	20
may easily	20
perfect sphere	20
short periods	20
dense atmosphere	20
new system	20
next chapter	20
never see	20
physical history	20
meteoritic material	20
von zach	20
outer space	20
various forms	20
giant stars	20
contained within	20
merge away	20
globular star	20
vegetable life	20
many persons	20
one will	20
better known	20
will ever	20
one hour	20
different colors	20
solar radiation	20
synodical period	20
atmospheric conditions	20
elapsed since	20
might seem	20
new planets	20
fall towards	20
nova cygni	20
great advantage	20
harvard observatory	20
strong enough	20
inner ring	20
turn round	20
astronomers royal	20
parallactic ellipse	20
thirty times	20
de chimie	20
living beings	20
sur les	20
magnitude companion	20
dark side	20
will go	20
high water	20
determine whether	20
four degrees	20
among astronomers	20
next return	20
past history	20
aqueous vapor	20
radiant heat	20
cambridge observatory	20
brother william	20
direct observation	20
third star	20
already explained	20
less bright	20
professor hale	20
single star	20
luminous bodies	20
case may	20
sir james	20
observer may	20
may mention	20
greek philosophers	20
three bright	20
hundredth part	20
turning round	20
now proceed	20
four moons	20
physical condition	20
last chapter	20
every revolution	20
turns round	20
apparent displacement	20
soon found	20
circular form	20
general rule	20
neap tides	20
comparative sizes	20
two lenses	20
due north	20
half way	20
whose components	20
sixteen feet	20
george iii	20
entire heavens	20
chapter viii	20
violet end	20
square root	20
four inches	20
sea level	20
terrestrial gravity	19
celestial spaces	19
rapid changes	19
scientific work	19
correspondent writes	19
great numbers	19
still remain	19
conspicuous object	19
observed phenomena	19
magnetic poles	19
sidereal period	19
three weeks	19
local time	19
one mile	19
nearest fixed	19
two sides	19
molten matter	19
also known	19
practical astronomer	19
months later	19
different positions	19
luminous vapor	19
solid bodies	19
infinite space	19
natural forces	19
large comet	19
whole year	19
highest degree	19
triple star	19
small telescopes	19
great luminary	19
new theory	19
now call	19
former case	19
kinetic theory	19
astronomical telescope	19
times farther	19
south sea	19
max wolf	19
circle around	19
seen without	19
eight inches	19
solar constant	19
still another	19
different regions	19
water vapor	19
light emitted	19
summer months	19
two principal	19
may fairly	19
bodies revolving	19
every thirty	19
southern heavens	19
sixteen years	19
often happens	19
heat received	19
distant object	19
clear sky	19
technical language	19
alvan clark	19
first attempt	19
directly overhead	19
nearly parallel	19
central point	19
ten degrees	19
new era	19
sidereal sphere	19
sidereal universe	19
planets around	19
well worth	19
caroline herschel	19
diurnal movement	19
lunar globe	19
prime vertical	19
star gamma	19
planet may	19
many observations	19
six stars	19
great square	19
every month	19
first thing	19
vastly greater	19
first suggested	19
true position	19
exact position	19
much lower	19
even one	19
trade winds	19
magnetic pole	19
many people	19
first one	19
orbit around	19
new continent	19
will fall	19
inner one	19
early times	19
sidereal heavens	19
inch hooker	19
main features	19
circling round	19
least two	19
may make	19
still farther	19
moon appears	19
way round	19
gold medal	19
general level	19
another planet	19
chemical constitution	19
lowell observatory	19
little later	19
moon around	19
de st	19
though still	19
iron meteorites	19
eleventh magnitude	19
terrestrial phenomena	19
six weeks	19
vacuum tube	19
brilliant stars	19
easily understood	18
star must	18
early astronomers	18
might easily	18
path around	18
moon system	18
mountain ranges	18
scientific research	18
great men	18
nebulous light	18
inner surface	18
periodic comets	18
will occur	18
central parts	18
body revolving	18
true theory	18
new ones	18
dark part	18
accurately known	18
greater degree	18
hydrogen gas	18
following lines	18
professor peirce	18
eruptive prominences	18
circle described	18
present purpose	18
strangely enough	18
quite possible	18
circular orbits	18
one night	18
convex lens	18
last half	18
liquid matter	18
angular velocity	18
next step	18
one mass	18
eighty degrees	18
three centuries	18
actual distance	18
light takes	18
great cluster	18
far removed	18
fifty minutes	18
within reach	18
new edition	18
two equal	18
set aside	18
greatest possible	18
much heat	18
time required	18
white star	18
almost exclusively	18
giant planet	18
gravitational attraction	18
solar systems	18
old times	18
highest point	18
planets must	18
annual temperature	18
small ones	18
without doubt	18
scarcely less	18
will prove	18
let fall	18
system may	18
apparent change	18
newtonian law	18
solid state	18
brought forward	18
report brit	18
positive absolute	18
different directions	18
inch aperture	18
will begin	18
two successive	18
see nothing	18
crescent moon	18
well established	18
fifteen degrees	18
force acting	18
sun moves	18
earliest times	18
outer half	18
apparent path	18
photographic plates	18
earth turns	18
lunar disc	18
must look	18
tons per	18
ten seconds	18
telescope may	18
august th	18
results obtained	18
one must	18
one month	18
comet may	18
might find	18
narrow limits	18
general law	18
meteoric iron	18
march th	18
full daylight	18
will soon	18
beautiful object	18
solar equator	18
smaller stars	18
horizontal parallax	18
pass away	18
star may	18
shall presently	18
small quantity	18
globular cluster	18
late years	18
exactly opposite	18
widely different	18
another world	18
thousand millions	18
important point	18
without much	17
every possible	17
may come	17
generally speaking	17
present knowledge	17
accurate knowledge	17
rudolphine tables	17
early evening	17
one kind	17
well enough	17
show us	17
open air	17
first two	17
crowded together	17
large masses	17
get rid	17
solar constitution	17
first great	17
immediate neighborhood	17
journey round	17
nine days	17
different latitudes	17
hundred pounds	17
personal equation	17
annular eclipse	17
sea fishes	17
celestial spheres	17
goes round	17
nearly thirty	17
observed facts	17
millionth part	17
great velocity	17
alexander von	17
february th	17
former times	17
special attention	17
generally known	17
piazzi smyth	17
flat ring	17
moon moves	17
southern sky	17
solar translation	17
charles ii	17
two seconds	17
slightly different	17
material universe	17
see appendix	17
chief star	17
harper brothers	17
pole will	17
already alluded	17
almost impossible	17
now suppose	17
professor langley	17
ever made	17
planetary nebula	17
spherical form	17
la nature	17
relatively small	17
mars will	17
one minute	17
black rains	17
great lick	17
circle passing	17
solar temperature	17
chapter xv	17
will perhaps	17
constellation hercules	17
larger one	17
say nothing	17
common motion	17
somewhat like	17
robert ball	17
nine times	17
diurnal circle	17
little bodies	17
moves around	17
will remain	17
astronomical tables	17
larger scale	17
external world	17
thirty degrees	17
major planets	17
might possibly	17
new astronomy	17
lower strata	17
told us	17
makes one	17
known planets	17
theoretical astronomy	17
will recollect	17
fossil remains	17
somewhere else	17
certain number	17
leopold von	17
nearly real	17
great masses	17
asia minor	17
surface must	17
just south	17
secondary planets	17
careful observations	17
whose orbit	17
great philosopher	17
western part	17
great mountain	17
general appearance	17
first case	17
attracts every	17
may become	17
black spot	17
cubic foot	17
revolutionibus orbium	17
mountain ring	17
two poles	17
closely associated	17
twelfth magnitude	17
little way	17
true meteoritic	17
harvard annals	17
easily found	17
elliptical orbit	17
greek letter	17
earth moved	17
larger ones	17
la rue	17
outer surface	17
even greater	17
face towards	17
great law	17
greater accuracy	17
one object	17
another great	17
system must	17
concentric rings	17
extremely difficult	16
greater velocity	16
nebulous ring	16
sometimes seen	16
large extent	16
two things	16
hundred stars	16
physical geography	16
bright rays	16
stars move	16
generally supposed	16
great man	16
different ways	16
one twenty	16
different bodies	16
spectroscopic method	16
discovery made	16
almost say	16
greatest brilliancy	16
general surface	16
mira ceti	16
moderate power	16
giving rise	16
us first	16
sea water	16
spectroscope shows	16
directed toward	16
high latitudes	16
twelve miles	16
must take	16
every body	16
immense number	16
space occupied	16
standing still	16
three laws	16
plant life	16
italian astronomer	16
continually changing	16
favourable circumstances	16
well acquainted	16
shall now	16
distinct vision	16
right shoulder	16
miles distant	16
break away	16
june th	16
every planet	16
interior surface	16
bad weather	16
see note	16
one else	16
whose existence	16
greenwich observations	16
lady huggins	16
commonly called	16
might take	16
faintest stars	16
every variety	16
curved line	16
minute particles	16
gaseous envelope	16
five seconds	16
might suppose	16
always remain	16
rotation period	16
chapter xii	16
large body	16
real motion	16
astronomical world	16
faint light	16
hardly possible	16
amateur astronomer	16
thirteen years	16
different kind	16
instrumental means	16
outer one	16
times larger	16
western sky	16
observation made	16
earliest ages	16
well defined	16
quite certain	16
infinite distance	16
planets revolving	16
rare occasions	16
wonderful discoveries	16
will readily	16
somewhat less	16
twenty thousand	16
density must	16
human knowledge	16
professor smyth	16
northern sky	16
primary planets	16
first day	16
upper regions	16
th november	16
alpha herculis	16
different character	16
accurately determined	16
neptunian planet	16
approaching us	16
infinite number	16
low temperature	16
fourth part	16
moves round	16
directly towards	16
stellar evolution	16
red rays	16
pacific ocean	16
curiously enough	16
complete circuit	16
tobias mayer	16
small angle	16
become acquainted	16
teach us	16
one respect	16
celestial photography	16
lower end	16
solar observatory	16
red light	16
actual size	16
great red	16
british isles	16
important question	16
great sea	16
meteoric bodies	16
magnetic equator	16
might say	16
work done	16
high tides	16
sidereal astronomy	16
spherical aberration	16
little group	16
telescope shows	16
considerably less	16
temperate zones	16
star marked	16
though perhaps	16
century later	16
must either	16
british museum	16
light travels	16
years earlier	16
lie within	16
lunar acceleration	16
seems almost	16
planets may	16
new method	16
danish astronomer	16
must pass	16
polar cap	16
inner satellite	16
volcanic phenomena	16
doubtful whether	16
circle will	16
already made	16
teaches us	16
greatly increased	16
interior construction	16
percival lowell	16
least three	16
german astronomer	16
stellar systems	16
central condensation	16
tidal wave	15
immense distance	15
many ways	15
mean value	15
makes us	15
will describe	15
twelve signs	15
star maps	15
slight change	15
small constellation	15
david brewster	15
great length	15
another form	15
distinctly visible	15
discoveries made	15
bodies may	15
apparent time	15
travel round	15
greater depth	15
small mirror	15
horizontal line	15
borne along	15
high velocity	15
became visible	15
two cases	15
half degrees	15
extreme tenuity	15
every portion	15
one satellite	15
apparent magnitude	15
vast extent	15
nebulous spots	15
electrical repulsion	15
soon afterwards	15
illuminated side	15
visible surface	15
eight feet	15
fall back	15
disturbing influence	15
space beyond	15
will suffice	15
two degrees	15
form one	15
great measure	15
astronomical clock	15
simple one	15
constellation leo	15
present form	15
found among	15
general way	15
two large	15
great height	15
carefully observed	15
exact astronomy	15
chapter xi	15
far larger	15
geographical position	15
much closer	15
north star	15
inner planets	15
important discovery	15
plainly visible	15
solar phenomena	15
latter part	15
physical connection	15
large portion	15
uniform motion	15
exact time	15
extremely minute	15
attracting body	15
two forms	15
one man	15
diffused light	15
recent investigations	15
whole series	15
surface will	15
largest telescopes	15
another part	15
whole number	15
smaller one	15
lost sight	15
just visible	15
southern skies	15
may occur	15
position among	15
whose distance	15
right ascensions	15
entire surface	15
due time	15
eastern side	15
circumpolar constellations	15
bright spot	15
whole volume	15
bright streaks	15
half inches	15
may exist	15
remarkable objects	15
nine hundred	15
first thought	15
planets jupiter	15
going round	15
nine months	15
isothermal lines	15
general view	15
miles thick	15
planetary velocity	15
tropical regions	15
little farther	15
star beta	15
everybody knows	15
moving along	15
sir jonas	15
equinoctial points	15
remarkable feature	15
apparent place	15
strongly marked	15
star catalogue	15
south africa	15
table ii	15
much shorter	15
gaseous matter	15
telescope reveals	15
one hemisphere	15
lower part	15
miles every	15
almost equal	15
many degrees	15
vast numbers	15
new dominant	15
years hence	15
every way	15
remarkable manner	15
motion will	15
times brighter	15
faded away	15
sun shines	15
incandescent gas	15
third quarter	15
true system	15
ordinary star	15
recently discovered	15
rain fell	15
regular solids	15
inquire whether	15
original position	15
another class	15
will tell	15
vast dimensions	15
nearly uniform	15
within one	15
william watson	15
telescopic appearance	15
practical purposes	15
wonderful object	15
solar prominences	15
knightes tale	15
telescopic comets	15
observer must	15
totally eclipsed	15
south poles	15
tenth century	15
carried away	15
roughly speaking	15
hours minutes	15
actually seen	15
certain point	15
great sun	15
even yet	15
celestial movements	15
august meteors	15
distance equal	15
celestial regions	15
footnote arago	15
transit across	15
chapter xiii	14
comparatively recent	14
less time	14
whose name	14
pretty well	14
nearly every	14
known fact	14
burst forth	14
first comet	14
planetary movements	14
one whose	14
elevated plateaux	14
following extract	14
middle latitudes	14
greek alphabet	14
enormous velocity	14
also made	14
must remain	14
tropical year	14
little dog	14
one instance	14
eighty miles	14
degrees apart	14
miles nearer	14
remarkable object	14
next night	14
various sizes	14
rotatory motion	14
often seen	14
next morning	14
small body	14
effect produced	14
made available	14
small circles	14
directly opposite	14
middle star	14
evening hours	14
sedimentary rocks	14
total mass	14
far advanced	14
easily see	14
computing room	14
daily revolution	14
first half	14
may regard	14
satisfactory explanation	14
great reflector	14
see venus	14
another method	14
fifteenth magnitude	14
new one	14
telescopic observation	14
lunar chart	14
eight hundred	14
spot cycle	14
professor adams	14
mean motion	14
already spoken	14
great star	14
distant planet	14
telescopic object	14
will easily	14
time went	14
two portions	14
neighbouring stars	14
chemical analysis	14
fifty million	14
omicron ceti	14
professor newton	14
spring equinox	14
comet must	14
pass near	14
sufficient accuracy	14
far exceeding	14
bound together	14
stellar points	14
small planet	14
may consider	14
great solar	14
nine hours	14
single exception	14
long afterwards	14
terrestrial planets	14
three quarters	14
almost certainly	14
two halves	14
already pointed	14
quite close	14
get away	14
first began	14
stars known	14
particular interest	14
kilometers per	14
every astronomer	14
temperate zone	14
planet rotates	14
certain parts	14
might also	14
second time	14
time will	14
connection existing	14
fifteen minutes	14
fastened round	14
precisely similar	14
intensely hot	14
eclipsed sun	14
tertiary formations	14
beautiful double	14
de coelo	14
two comets	14
continental masses	14
heat radiated	14
dudley observatory	14
alexandrian school	14
ten feet	14
also found	14
two pairs	14
stars scattered	14
facing page	14
attract attention	14
two particles	14
great accuracy	14
polar light	14
long periods	14
almost infinitely	14
always appear	14
southern hemispheres	14
cannon ball	14
move around	14
hollow shell	14
actual measurement	14
yet made	14
mare crisium	14
true place	14
outer planet	14
one common	14
vast majority	14
professor holden	14
now let	14
will sometimes	14
clearly seen	14
must depend	14
magnetic observations	14
within three	14
metallic lines	14
last year	14
interesting object	14
great care	14
whole extent	14
called canals	14
high mountains	14
original text	14
travels round	14
many hours	14
doubt whether	14
star appeared	14
southern stars	14
given place	14
solar motion	14
great french	14
just one	14
little dipper	14
tidal action	14
eastern part	14
nine miles	14
constellation lyra	14
image formed	14
feet thick	14
among others	14
different rates	14
certain definite	14
red sandstone	14
one years	14
physical nature	14
meteorological processes	14
annales de	14
fairly well	14
present age	14
great dipper	14
round one	14
nearly five	14
star whose	14
photographic refractor	14
now turn	14
first star	14
included within	14
meteoric showers	14
informs us	14
gilt top	14
solid nucleus	14
two branches	14
left us	14
first four	14
sixty times	14
may refer	14
must make	14
astronomical studies	14
circular orbit	14
stars rise	14
higher powers	14
sun belongs	14
star clouds	14
zodiacal signs	14
one step	14
one portion	14
solar day	14
will remember	14
shorter time	14
carefully measured	14
even among	14
remarkable phenomenon	14
rock fragments	14
french mathematician	14
common focus	14
eastern limb	14
celestial globe	14
sea bottom	14
first instance	14
several observers	14
feet focal	14
descriptive astronomy	14
refracting telescopes	14
full moons	14
new science	14
assure us	14
put forth	14
shall take	14
us turn	14
william thomson	14
look back	14
northern lights	14
real nature	14
new instrument	14
telescope tube	14
one plane	14
northern part	14
stars like	13
september th	13
large instruments	13
sedimentary strata	13
throw light	13
spiral structure	13
giant planets	13
true direction	13
always present	13
upper strata	13
time occupied	13
long journey	13
mud volcanoes	13
smaller scale	13
setting aside	13
stars just	13
large planet	13
might appear	13
travelling round	13
crab nebula	13
little beyond	13
ever lived	13
moving round	13
dog star	13
seen projected	13
red colour	13
every place	13
elder herschel	13
volcanic forces	13
globe must	13
every two	13
crossley reflector	13
great pressure	13
footnote leop	13
opposite part	13
old style	13
mean solar	13
terrestrial volcanoes	13
many small	13
admiral smyth	13
considerable size	13
many respects	13
stars form	13
first saw	13
drawings made	13
among many	13
annual register	13
two astronomers	13
gustav rose	13
seems probable	13
every three	13
mere point	13
five stars	13
will gradually	13
actually see	13
light may	13
forty times	13
just now	13
midnight sky	13
southern part	13
still earlier	13
easy double	13
singular fact	13
twelve hundred	13
stars around	13
necessary consequence	13
fifty times	13
will say	13
half miles	13
previously known	13
longer time	13
whose work	13
northern cross	13
ancient eclipses	13
next great	13
closely related	13
elliptical orbits	13
british islands	13
distant star	13
may note	13
star eta	13
small masses	13
may serve	13
two separate	13
light will	13
earth revolved	13
daily life	13
relative motion	13
large planets	13
south lat	13
word greek	13
principal planets	13
quite clear	13
always equal	13
always turned	13
critical velocity	13
cometary orbits	13
looking like	13
atmospheric absorption	13
orbium coelestium	13
heavy bodies	13
octagon chapel	13
already found	13
light years	13
hercules cluster	13
savilian professor	13
jovian nebula	13
eta argus	13
scientific knowledge	13
telescopic view	13
black drop	13
favourable conditions	13
various distances	13
direct motion	13
brilliant light	13
photographic method	13
great heat	13
star known	13
optical power	13
science gossip	13
like one	13
principal star	13
us next	13
eighth sphere	13
lies directly	13
coronal photographs	13
careful measurements	13
saturnian system	13
two motions	13
will perceive	13
nearly six	13
whole length	13
quite possibly	13
various places	13
heat may	13