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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
of
drive
effect
of
eccentricity
spread
of
echo
visibility
of
eclipse
pole
of
ecliptic
symbol
of
element
periodic system
of
elements
apparent angle
of
elevation
degree
of
ellipticity
angle
of
emergency
source
of
emission
method
of
emission of radio waves
zero
of
energy
pole
of
equator
equation
of
equilibrium
epoch
of
equinox
precession
of
equinoxes
principle
of
equivalence
source
of
errors
principle
of
exclusion
retardation
of
expansion
method
of
expansions
threshold
of
exposure
zone of obscuration
of
external galaxies
cloud
of
extra galactic nebulae
background
of
extragalactic sources
threshold gradient sensitivity function
of
eye for grains
boil
off
speed
of
fading
off-axis
off-axis
aberration
off-axis
distribution
off-axis
English mounting
off-axis
guider
off-axis
guiding
off-axis
mirror
off-axis
rays
principle
of
Fermat
apparent rotation by refraction
of
field
polar crown
of
filaments
group
of
fixed lines
flash phase
of
flare
frequency
of
flare occurrence
rate
of
flow of radiation
depth
of
focus
line
of
force
atomic heat
of
formation
degree
of
freedom
radio range
of
frequencies
rate
of
frequency drift
angular separation
of
fringes
offset
off-set
guider
off-set
guiding
system
of
fundamental proper motion
direction
of
galactic center
dissociation
of
galactic cluster
component components
of
galactic emission
zero
of
galactic longitude
bulk
of
galactic radiation
map
of
galactic radio emission
sequence
of
galactic types
Catalog of Galaxies and clusters
of
Galaxies
Catalog
of
Galaxies and clusters of Galaxies
shell
of
gas
liberation
of
gases
theory
of
general relativity
compression
of
geoid
plane-parallel plate
of
glass
field
of
good definition
blazing
of
grating
Newton's theory
of
gravitation
force
of
gravity
radio telescope
of
great sensitivity
dissolution
of
group
theoretical curve
of
growth
broadside array
of
half-wave dipoles
line
of
Hα
vault
of
heaven
valence theory
of
Heitler-London
field
of
high definition
dip
of
horizon
local system
of
hydrogen
mass
of
hydrogen atom
map
of
hydrogen in galactic plane
quantity
of
illumination
vibration
of
image
quality
of
images
moment
of
impact
angle
of
incidence
product
of
inertia
system
of
instrument
prohibition
of
intercombinations
source
of
interference
ratio of minimum to maximum
of
interference fringes
telescope
of
intermediate aperture
principle
of
invariance
degree
of
ionicity
state
of
ionization
abundance
of
isotopes
radio longitudes
of
Jupiter
circle
of
least confusion
tilt
of
lens
population
of
levels
first point
of
Libra
equation
of
light
velocity
of
light in vacuum
core
of
line
polarization
of
lines
limit
of
line series
star
of
low metal content
threshold
of
luminescence
range
of
luminosity
bridging arm
of
luminous matter
reversal
of
magnetic polarity
chromatic difference
of
magnification
threshold
of
magnitude
construction
of
map
center
of
mass
outflow
of
matter
time
of
maximum
uncertainty
of
measurement
transit
of
Mercury
time
of
meridian passage
passage
of
meteor
fall
of
meteorite
delineation
of
meteor radiants
storm
of
meteors
signature
of
metric
scale
of
micrometer
large outbursts
of
microwave radiation
magnitude
of
minimum
ray
of
minimum deviation
ratio
of
minimum to maximum in record
ratio
of
minimum to maximum of interference fringes
flexure
of
mirror
telescope
of
moderate power
moment
of
momentum
pair
of
movable wires
diagonal line
of
multiplet
alternation law
of
multiplicities
collision
of
nebulae
local structure
of
neutral hydrogen
creation
of
new material
regression
of
nodes
source
of
noise
source
of
noise storm
altitude
of
North Pole
nebular stage
of
nova
constant
of
nutation
zone
of
obscuration of external galaxies
band
of
obscuring matter
weight
of
observation
spread
of
observations
choosing
of
observatory site
visibility
of
occupation
frequency
of
occurence
rate
of
occurrence
duration
of
one fringe
degree
of
openness of spiral
wavelength
of
operation
ratio
of
optical to radio emission
error
of
orientation
region
of
origin
region
of
over-exposure
period
of
overlap of two cycles
Astronomical Society
of
Pacific
trigonometric series
of
parallaxes
ejection
of
particles
difference
of
path
argument
of
perihelion
time
of
perihelion passage
motion
of
perihelion (point)
range
of
phase angles
turbulence spectrum
of
photosphere
investigation of shape
of
pivots
brightening
of
plage
disk temperature
of
planet
laws
of
planetary motion
system
of
planets
transmission
of
plate
method
of
plate constants
supernovae
of
plates
manifold
of
points
state
of
polarisation
law
of
polarity
reversal
of
polarization
prediction
of
position
constant
of
precession
Lorentz theory
of
pressure broadening
base
of
prominence
poleward migration
of
prominences
factor
of
proportionality
shape
of
pulse
echo cross-section
of
radar
transfer
of
radiation
theories
of
radiative transfer
map
of
radio brightness
brightness distribution
of
radio disk
mechanism
of
radio emission
distribution
of
radio energy
background
of
radio radiation
spectrum
of
radio source
survey
of
radio sources
occupation
of
radio star
scintillation
of
radio stars
ratio
of
radio to light emission
ratio
of
radio to optical power emitted
strength
of
radio waves
slope
of
ray
noisiness
of
receiver
speed
of
recession
principle
of
reciprocity
method
of
recording transits
system
of
reference
arm
of
reflectors
law
of
refraction
special theory
of
relativity
threshold
of
resolution
local standard
of
rest
angular rate
of
rotation
synodic period
of
rotation at the equator
origin
of
scale
measurement
of
seeing
threshold
of
sensitivity
investigation
of
shape of pivots
telescope
of
short focal length
radiant
of
shower
line
of
sight
line
of
sight velocity
range dispersion
of
signals
principle
of
similarity
sweeps
of
sky
tilting screen made
of
slats
forecast
of
solar activity
maximum phase
of
solar cycle
millionth
of
solar disk
burst
of
solar noise
components
of
solar radio emission
higher intensity component
of
solar radio waves
period
of
solar rotation
radar observations
of
solar system
boundedness
of
solution
transit
of
source
angular distribution
of
sources
permittivity
of
space
parentage
of
spectral terms
order
of
spectrum
degree of openness
of
spiral
birth
of
spot
orientation
of
spot group
trail
of
star
polarization
of
starlight
subsystem
of
stars
time
of
start
photoelectric registration
of
star transit
Chandrasekhar's parametric equations
of
state
mutual interaction
of
states
classification
of
stellar spectra
sequence
of
structural forms
heat
of
sublimation
pressure
of
sunlight
magnetic life history
of
sun-spot
longitudinal motion
of
sunspots
debris
of
supernova
method
of
support
plane
of
symmetry
theory
of
synchrotron emission
sensitivity
of
system
line
of
syzygies
scale Value
of
telescope
longitude
of
the ascending node
Publication
of
the Astronomical Society of the Pacific
Handbook
of
the British astronomical association
lengthening
of
the day
mantle
of
the Earth
obliquity
of
the ecliptic
precession
of
the equinoxes
rotation
of
the field of view
scale
of
the Galaxy
radio emission
of
the halo
dip
of
the horizon
standard error
of
the mean
plane
of
the Milky Way
profile
of
the Moon
theory
of
the Moon's motion
shininess
of
the Moon's surface
Publication of the Astronomical Society
of
the Pacific
image
of
the radio Sun
coefficient
of
thermal expansion
Doppler effect
of
thermal motion
member
of
the solar system
in the vicinity
of
the Sun
remnants
of
the supernova of A. D.
theory
of
the universe
sign
of
the zodiac
second
of
time
band
of
totality
retardation
of
transit
spread in time
of
travel
top
of
tube
period of overlap
of
two cycles
region
of
under-exposure
technique
of
unfilled apertures
column
of
unit cross sectional area
error
of
unit weight
law
of
universal gravitation
Association
of
Universities for Research in Astronomy
American Association
of
Variable Star Observers
general catalog
of
variable stars
range
of
variation
transit
of
Venus
true field
of
view
threshold
of
visibility
millionth
of
visible hemisphere
field
of
vision
increment
of
visual threshold
radio range
of
wavelengths
under conditions
of
weightlessness
interferometer
of
wide spacing
effects
of
wind
burst
of
X-rays
array
of
Yagi antennas
array
of
Yagis
Lorentz theory
of
Zeeman effect
plane
of
zodiac
law
of
zones
OH
OH
line
O-III
oil
pad
oil-pad
bearing
Okayama
observatory
Olbers'
paradox
old
Moon
new Moon in the
old
Moon's arms
old
nova
old
quantum theory
old
star
omnidirectional
antenna
omnidirectional
flux
once-through
corrector plate
Ondrejov
observatory
one-dimensional
classification
one-dimensional
distribution
one-dimensional
synthesis
duration of
one
fringe
one-layered
model
Onsala
observatory
onstant
wave
setting
on
star
on
the fringe of...
earthshine
on
the Moon
on
the wane
to train
on
to an object
Information Bulletin
on
Variable Stars
Ootacamund
observatory
continuous
opacity
opacity
law
opaque
atmosphere
opaque
photocathode
opaque
region
opaque
screen
open
cluster
shutter
opening
degree of
openness
of spiral
open
spiral
open
tubes
operating
frequency
operating
position
operating
region
operating
wavelength
wavelength of
operation
telescope
operator
oppositely
polarized
opposite
polarities separating line
opposite
polarity
opposition
optic(al)
optical
aberrations
optical
absorption
Cambridge
optical
aperture synthesis array
optical
arrangement
prime-focus
optical
assembly
optical
astronomer
instrumentation for
optical
astronomy
National
Optical
Astronomy Observatories
optic(al)
axis
optical
axis
optical
beam
optical
binary star
optical
brightness
optical
brightness temperature
optical
center
optical
components
optical
cross-section
optical
data
optical
definition
optical
density
optical
depth
optical
detection
optical
device
optical
disk
optical
distortions
optical
disturbance
optical
double
optical-double
resonance method
optical
double star
optical
doublet
optical
effects
optical
efficiency
optical
element
optical
emission
optical
emitting region
optical
evidence
optical
extinction
optical
features
optical
flare
optical
flat
optical
galaxy
optical
glass
optical
haze
optical
identification
optical
image
optical
index
optical
information
optical
instruments
optical
intensity
optical
interference
optical
interferometer
optical
isophotes
optical
libration
optical
luminosity
to identify
optically
optically
identified source
optical
magnitude
optical
maser
optical
material
optical
means
optical
measurements
optical
meteor observations
optical
method
optical
mirror
optical
nerve
optical
object
optical
obscuration
optical
observations
optical
observatory
optical
parallax
optical
path
optical
performance
optical
phenomenon
optical
polishing
optical
position
optical
power
ratio of radio to
optical
power emitted
optical
precision
optical
process
optical
properties
optical
quality
optical
quartz
optical
radiation
optical
redshift
optical
reflector
optical
refraction
optical
region
optical
resolution
optical
resolving power
optical
results
optical
rocket-tracking telescope
optical
scattering
optical
semithickness
optical
sensitization
optical
series
optical
shadow
optical
silica
optical
size
optical
spectral line
optical
spectroscope
optical
spectroscopy
optical
spectrum
optical
star
optical
studies
optical
Sun
optical
sunspot
optical
surface
telescope
optical
system
optical
techniques
optical
telescope
optical
tests
radial
optical
thickness
ratio of
optical
to radio emission
optical
tracking
optic(al)
tracking instrument
optical
transfer function
optical
tube
optical
turbulence
optical
universe
optical
wavelengths
optical
wedge
optical
window
optical
work
optic
eclipse
optic
purple
multi-coated
optics
optimal
filter
optimum
sampling
O-radiation
satellite in long-lived
orbit
spin
orbital
orbital
angular momentum
orbital
degeneracy
orbital
eccentricity
orbital
elements
orbital
energy
orbital
inclination
orbital
inclination to the equator
orbital
motion
orbital
period
orbital
plane
orbital
quantum number
orbital
radius
orbital
rocket
orbital
speed
orbital
vehicle
orbital
velocity
orbit
determination
orbiter
orbit
form
orbiting
orbiting
astronomical observatory
orbiting
observatory
orbiting
satellite
orbiting
station
molecular
orbit
method
orbit
prediction
Earth's
orbit
radius
Stormer
orbits
size
orbit
size
spectral
order
ordered
magnetic field
zero
order
frequency
order
of spectrum
overlapping
orders
order
sorter
second
order
Stark effect
ordinary
ray
ordinary
wave
orientation
orientation
effect
orientation
of plate
orientation
of spot group
region of
origin
original
atmosphere
original
image
original
plate
origin
of coordinates
origin
of radio waves
origin
of scale
origin
of the universe
orographical
orrery
orrery
software
image
orthicon
orthochromatic
orthodromics
orthodromy
orthogonality
orthogonal
polarization
orthohelium
orthohydrogen
orthomodification
orthoscopic
orthoscopic
eyepiece
ortochromatic
emulsion
ortoscopic
ortoscopic
eyepiece
Oschin
Schmidt camera
rotational
oscillation
Global
Oscillation
Network Group
space-charge
oscillations
local
oscillator
oscillator
strength
cathode-ray
oscillograph
display
cathode ray
oscilloscope
osculating
elements
osculating
orbit
Osservatorio
di Bologna
Osservatorio
di Brera
O
star
O-type
star
our
galaxy
to smear
out
supernova
outburst
outburst
from Jupiter
outburst
of light
outburst
of radio waves
microwave
outbursts
outburst sporadic
outbursts
of craters
large
outbursts
of microwave radiation
outburst
sporadic outbursts of craters
outcoming
electron
far
outer
arm
outer
atmosphere
outer
core
outer
corona
outer
photoeffect
outer
planet
outer
radiation zone
outer
regions
outer
ring
outer
space
outer-space
rocket
outflow
of matter
outgoing
electron
out
of focus
out-of-focus
out-of-focus
image
out-of-plane
vibration
total power
output
receiver
output
fluctuations
receiver
output
meter
output
power
outward
flow
outward
intensity
outward
motion
outward
stream
oval
mirror
spill
over
overall
detection efficiency
overall
directional diagram
overall
gamma
overall
illumination
overall
integral
overall
noise temperature
overall
pointing error
overall
radiometer system noise
overall
sensitivity
overall
system noise
over
coating
overdense
column
overdense
cylinder
overdense
trail
overdeveloped
overdevelopment
overexpose
overexposed
region of
over-exposure
overexposure
overlap
overlap
of absorption lines
period of
overlap
of two cycles
overlapping
overlapping
orders
overlapping
pulses
over
sampling
oversensitization
overstability
overtone
overtone
band
Owens
valley observatory
oxygen
oxygen
absorption
oxygen
abundance
Oxygen-III
filter
ozone
ozone
absorption
ozone
F
ozonosphere
o
aphelion
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