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A&ATr
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A
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B
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C
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D
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E
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F
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G
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H
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I
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J
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K
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L
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M
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N
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O
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P
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Q
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R
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S
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T
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U
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V
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W
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X
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Y
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Z
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1769 "O"
atmospheric
O
2 band
O
association
obiateness
deep sky
object
object
glass
object-glass
object
illumination
wide-angle
objective
objective
cell
objective
classification
objective
grating
objective
lens
object(ive)
mirror
objective
prism
objective-prism
camera
objective-prism
spectrum
object
under observation
oblateness
oblate
spheroid
oblate
symmetric top
precession in
obliquity
obliquity
of ecliptic
obliquity
of the ecliptic
O-branch
optical
obscuration
zone of
obscuration
of external galaxies
obscuring
clouds
dark
obscuring
lane
obscuring
matter
observable
observable
object
observable
sources
observable
universe
weight of
observation
observation
airborne observation
observational
observational
astronomy
to process the
observational
data
observational
details
observational
error
observational
evidence
observational
material
observational
method
observational
procedures
observational
program(me)
observational
radio astronomy
observational
results
observational
selection
observational
technique
observational
test
observational
uncertainty
observational
work
observation
floor
false
observations
observations
in right ascension
radar
observations
of solar system
observations
with telescopes
observation
time
Observatoire
de Haute Provence
observatorial
selection
National Optical Astronomy
Observatories
Observatorio
Astronomico Nacional
Observatorio
del Rogue de los Muchachos
Observatorio
del Teide
Zelenchukskaya
observatory
observatory
building
observatory
clock
observatory
dome
Royal
observatory,
Edinburgh
Royal
observatory,
Greenwich
choosing of
observatory
site
observatory
site selection
observatory
site survey
Palomar
observatory
sky survey
observe
observed
observed
altitude
observed
motion
observed
object
observed
position
observed
radiation
observed
ratio
observed
star
observed
velocity
terrestrial
observer
observer
personal equation
American Association of Variable Star
Observers
observer's
cage
observer's
cell
observer's
chair
observer's
horizon
observer's
meridian
observer's
position
observer's
station
solar
observing
observing
chair
observing
conditions
observing
expedition
observing
frequency
observing
instruments
observing
night
observing
platform
observing
point
coude
(observing)
position
prime
observing
position
observing
program(me)
observing
room
observing
seat
observing
site
robot
observing
station
observing
technique
observing
time
observing
tour
occult
occultation
occulting
disk
visibility of
occupation
occupation
by the Moon
occupation
curve
occupation
of radio star
occupation
of star
frequency of
occurence
rate of
occurrence
oce
Ockham's
razor
octant
octet
multiplet
Ramsden
ocular
ocular
prism
odd
odd
atomic term
odd-odd
nucleus
odd
spot cycle
state
odd
state
oersted
telescope, invention
of
on the fringe
of...
overlap
of
absorption lines
equinox
of
a catalogue
arm
of
a cross
quantum
of
action
center
of
activity
remnants of the supernova
of
A. D.
star
of
advancing spectral type
effect
of
aging
circle
of
altitude
resolution
of
a nebula
precession
of
angular momentum
calibration
of
antenna
plane
of
aperture
line
of
apsides
matter
of
arbitrariness
minute
of
arc
law
of
areas
first point
of
Aries
longitude
of
ascending node
depth
of
asphericity
family
of
asteroids
system
of
astronomical constants
techniques
of
astronomy
stellar remnant
of
a supernova
sudden enhancement
of
atmospherics
force
of
attraction
zone
of
avoidance
isotropic component
of
background radiation
scheme
of
band heads
hading
of
bands
limit
of
band series
breaking-off
of
band system
direction
of
baseline
range
of
brightness response
system
of
bright rays
Journal
of
British Astronomical Association
law
of
Bunsen and Roscoe
reform
of
calendar
tropic
of
Cancer
tropic
of
Capricorn
system
of
catalogue
identification
of
central fringe
time
of
central maximum
support
of
chromosphere
reading
of
circle
near point
of
clear vision
effects
of
clustering of galaxies
head
of
column of ionization
halo es
of
comet
system
of
comets
set
of
comparison stars
equations
of
condition
effect
of
confusion
time
of
conjunction
polarization
of
continuum
origin
of
coordinates
polarization
of
core
flattening
of
corona
region
of
correct exposure
application
of
correction
curve
of
correlation
components
of
cosmic radiation
isotropy
of
cosmic rays
outburst sporadic outbursts
of
craters
field
of
critical definition
center
of
curvature
law
of
darkening
techniques
of
data processing
principal source
of
decameter activity
method
of
dependences
limit
of
detectability
number
of
detectable sources
threshold
of
detection
life
of
developer
angle
of
diffraction
angle
of
dip
broadside array
of
dipoles
angle
of
dispersion
heat
of
dissociation
relative scale
of
distances
Hartley's law
of
doublet separating
rate