• O association
• obiateness
• object
• object glass
• object-glass
• object illumination
• objective
• objective cell
• objective classification
• objective grating
• objective lens
• objective mirror
• objective prism
• objective-prism camera
• objective-prism spectrum
• object mirror
• object under observation
• oblateness
• oblate spheroid
• oblate symmetric top
• obliquity of ecliptic
• obliquity of the ecliptic
• O-branch
• obscuration
• obscuring clouds
• obscuring matter
• observable
• observable object
• observable sources
• observable universe
• observation
• observation airborne observation
• observational
• observational astronomy
• observational data
• observational details
• observational error
• observational evidence
• observational material
• observational method
• observational procedures
• observational program
• observational programme
• observational radio astronomy
• observational results
• observational selection
• observational technique
• observational test
• observational uncertainty
• observational work
• observation floor
• observations in right ascension
• observations with telescopes
• observation time
• Observatoire de Haute Provence
• observatorial selection
• Observatorio Astronomico Nacional
• Observatorio del Rogue de los Muchachos
• Observatorio del Teide
• observatory
• observatory building
• observatory clock
• observatory dome
• observatory site selection
• observatory site survey
• observe
• observed
• observed altitude
• observed motion
• observed object
• observed position
• observed radiation
• observed ratio
• observed star
• observed velocity
• observer personal equation
• observer's cage
• observer's cell
• observer's chair
• observer's horizon
• observer's meridian
• observer's position
• observer's station
• observing
• observing chair
• observing conditions
• observing expedition
• observing frequency
• observing instruments
• observing night
• observing platform
• observing point
• observing position
• observing program
• observing programme
• observing room
• observing seat
• observing site
• observing station
• observing technique
• observing time
• observing tour
• occult
• occultation
• occulting disk
• occupation
• occupation by the Moon
• occupation curve
• occupation of radio star
• occupation of star
• oceсимметричная проблема
• Ockham's razor
• octant
• octet multiplet
• ocular
• ocular prism
• odd
• odd atomic term
• odd-odd nucleus
• odd spot cycle
• oersted
• off-axis
• off-axis aberration
• off-axis distribution
• off-axis English mounting
• off-axis guider
• off-axis guiding
• off-axis mirror
• off-axis rays
• offset
• off-set guider
• off-set guiding
• OH line
• oil pad
• oil-pad bearing
• Okayama observatory
• Olbers' paradox
• old moon
• old Moon
• 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
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• one-layered model
• Onsala observatory
• onstant wave
• on the fringe of...
• on the wane
• Ootacamund observatory
• opacity
• opacity law
• opaque atmosphere
• opaque photocathode
• opaque region
• opaque screen
• open cluster
• opening
• open spiral
• open tubes
• operating frequency
• operating position
• operating region
• operating wavelength
• operation
• operator
• oppositely polarized
• opposite polarities separating line
• opposite polarity
• opposition
• optic
• optical
• optical aberrations
• optical absorption
• optical arrangement
• optical astronomer
• optical astronomy
• 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
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