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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