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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