• daily
• daily error
• daily map
• daily motion
• daily revolution
• daily rotation
• daily variation
• Dall-Kirkham telescope
• Dalton law
• damp air
• damped oscillation
• damping
• damping broadening
• damping constant
• damping factor
• damping wing
• Danjon astrolabe
• Danjon scale
• dark absorption nebula
• dark adaptation
• dark area
• dark band
• dark cloud
• dark companion
• dark current
• dark dome
• darkening
• darkening coefficient
• darkening to limb
• dark exposure
• dark flocculus
• dark Fraunhofer lines
• dark hemisphere
• dark line
• dark material
• dark nebula
• darkness
• dark noise
• dark obscuring lane
• dark obscuring matter
• dark room
• dark-room illumination
• dark side
• dark sky background
• dark slide
• dark star
• dark subtraction
• dashed term
• data
• data analysis
• data processing
• data reduction
• date
• date line
• date of supernova
• D atom
• David Dunlap observatory
• Dawes limit
• dawn
• day
• day airglow
• day glow
• daylight
• daylight exposure
• daylight hemisphere
• daylight saving time
• daylight side
• daylit hemisphere
• day numbers
• day side
• day sky
• day-time meteor
• day-time meteor activity
• daytime radiant
• daytime shower
• daytime stream
• dazzlernent
• DC comparison radiometer
• deactivating collision
• dead air
• dead reckoning position
• dead time
• debris
• debris of supernova
• de Broglie wavelength
• decameter activity
• decameter band
• decameter burst
• decameter emission
• decameter observations
• decameter radiation
• decameter radio sources
• decameter radio storm
• decameter radio waves
• decameter range
• decameter source regions
• decameter sources
• decameter spectrum
• decameter-wave emission
• decameter wavelength band
• decameter wavelength radiation
• decameter wavelength range
• decameter wavelength region
• decameter wavelengths
• decameter waves
• decameter-wave spectrum
• decametric
• decametric emission
• decay
• decayed atom
• decay law
• decay photon
• deceleration
• decibel
• decimeter band
• decimeter burst
• decimeter component
• decimeter continuum
• decimeter emission
• decimeter observations
• decimeter radiation
• decimeter radio waves
• decimeter range
• decimeter spectrum
• decimeter-wave emission
• decimeter wavelength band
• decimeter wavelength radiation
• decimeter wavelength range
• decimeter wavelength region
• decimeter waves
• decimeter-wave spectrum
• decimetric emission
• decimillistilb
• declination
• declination and right ascension
• declination angle
• declination axis
• declination-axis bearings
• declination bearings
• declination box
• declination-box frame
• declination circle
• declination determinations
• declination drive
• declination-drive system
• declination gear
• declination gear device
• declination micrometer
• declination motion
• declination observations
• declination trunnion
• declination worm
• decline rate
• decollimation
• decomposition probability
• deconvolution
• decrease
• decrement
• decrement of visual threshold
• deep-dust model
• deep sky filter
• deep sky object
• deep space network
• deexcitation
• defect
• defective illumination
• deferent
• define
• defining
• defining pad
• defining support
• definition
• deflection
• deflection angle
• deflection drift
• defocus
• defocusing
• deformation
• deformation vibration
• degeneracy
• degenerate
• degenerated
• degenerated species
• degenerate electron
• degenerate gas
• degenerate gas law
• degenerate matter
• degenerate star
• degenerate state
• degrading of bands
• degree
• degree of arc
• degree of dissociation
• degree of ellipticity
• degree of freedom
• degree of ionicity
• degree of ionization
• degree of openness of spiral
• delay
• delayed pulse
• delay line
• delineation of meteor radiants
• Dellinger effect
• Delta Cephei stars
• demount
• dense cluster
• density
• density difference
• density distribution
• density distribution of hydrogen
• density gradient
• density in space
• density ionization
• density law
• density of galaxies
• density of matter
• density of plate
• depolarization
• depolarization factor
• depolarizer
• depression
• depression of continuum
• depth
• depth of asphericity
• depth of focus
• descending node
• descriptive astronomy
• deserts
• design
• de Sitter's model
• de Sitter's universe
• desk
• Deslandres-d'Azambuja bands
• Deslandres table
• destructive interference
• detail
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• detailed balancing
• detailed exposure
• detailed structure
• detection
• detective quantum efficiency
• detectivity
• detector
• detector image detector
• deterioration of image
• determinant
• determination
• detonating bolide
• deuterium
• deuterium line
• deuterium line radiation
• develop
• developability
• developed image
• developed plate
• developer
• developing
• developing bath
• developing room
• development
• development curve
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