• cabin
• cage
• cage end of tube
• Calar Alto observatory
• calcite
• calcium
• calcium flocculus
• calcium lines
• calcium plage
• calcium plage areas
• calcium prominence
• calcium spectroheliogram
• calculate
• calculations
• calculator
• Caldwell catalog
• calendar
• calendar date
• calendar day
• calendar year
• calibrating source
• calibration
• calibration curve
• calibration exposure
• calibration noise source
• calibration of antenna
• calibration signal
• calibration source
• calibrator
• Caltech sub-millimeter observatory
• Cambridge optical aperture synthesis array
• camcorder
• camera
• camera optics
• camera tube
• Cameron bands
• Canada balsam
• Canada-France-Hawaii telescope
• canal
• candela
• candle
• candle power
• candle-power distribution
• canonical transformation
• cap
• capability of telescope
• capacity
• cap prominence
• capture
• capture cross-section for electrons
• capture process
• capture theory
• carbon
• carbon arc
• carbon cycle
• carbon dioptry
• carbon-nitrogen cycle
• carbon-nitrogen reaction
• carbon sequence
• carbon star
• card catalogue
• cardinal points
• carriage
• carrier gas
• carrier vehicle
• Carrington rotation
• Carte du Ciel
• cascade intensifier
• cascade transition
• case
• Cassegrain
• Cassegrain arrangement
• Cassegrain beam
• Cassegrain focal plane
• Cassegrain focal point
• Cassegrain focal ratio
• Cassegrain focus
• Cassegrainian
• Cassegrainian focus
• Cassegrainian telescope
• Cassegrain instruments
• Cassegrain-Maksutov telescope
• Cassegrain mirror
• Cassegrain optical path
• Cassegrain position
• Cassegrain reflector
• Cassegrain secondary
• Cassegrain spectrograph
• Cassegrain system
• Cassegrain telescope
• cataclysmic variables
• catadioptric
• catadioptric system
• catadioptric telescope
• catalog
• catalog equinox
• Catalog of Galaxies and clusters of Galaxies
• catalogue
• catalogue position
• cathode
• cathode aperture
• cathode-ray oscillograph display
• cathode ray oscilloscope
• cathode-ray tube
• cathodic
• cathodoluminescence
• catoptric
• catoptrical
• catoptrics
• catoptric system
• catoptric telescope
• cat's eye photometer
• Cauchy formula
• caustic
• C band
• CCD detector
• CD star
• celestial
• celestial body
• celestial coordinates
• celestial coordinate system
• celestial dome
• celestial equator
• celestial gamma rays
• celestial globe
• celestial horizon
• celestial latitude
• celestial longitude
• celestial mechanics
• celestial meridian
• celestial motions
• celestial object
• celestial photography
• celestial pole
• celestial position
• celestial source
• celestial sphere
• cell
• cellular mirror
• Celsius degree
• centennial proper motion
• center
• Center for High Angular Resolution Astronomy
• center hole
• centering error
• center limb variation
• center line
• center of activity
• center of curvature
• center of emission
• center of gravity
• center of mass
• center to limb variation
• centimeter band
• centimeter burst
• centimeter component
• centimeter emission
• centimeter observations
• centimeter radiation
• centimeter radio waves
• centimeter range
• centimeter spectrum
• centimeter-wave burst
• centimeter-wave emission
• centimeter wavelength band
• centimeter wavelength radiation
• centimeter wavelength range
• centimeter wavelength region
• centimeter wavelengths
• centimeter waves
• centimeter-wave spectrum
• centimetric emission
• centimetric radio waves
• central
• central bar
• Central Bureau for Astronomical Telegrams
• central collision
• central concentration
• central condensation
• central core of image
• central cube
• central force
• central frequency
• central fringe
• central Hα intensity
• central hole
• central image
• central intensity
• central interferometer equipment
• central maximum
• central meridian
• central-meridian passage
• central mountain
• central peak
• central projection
• central rays
• central region of the Galaxy
• central reversal
• central shutter
• central star
• central temperature
• central zone
• centre
• Centre de Donnees astronomiques de Strasbourg
• Centre National d'Etudes Spatiales
• centrifugal acceleration
• centrifugal distortion
• centrifugal force
• centrifugal governor
• centrifugal stretching
• centripetal acceleration
• centroid diagram
• century
• Cepheid luminosity
• Cepheids
• Cepheid stars
• Cepheid variables
• Cepheid variable stars
• Cerenkov detector
• Cerenkov effect
• Cerenkov radiation
• Cerro Pachon observatory
• Cerro Paranal observatory
• Cerro Tololo Inter-American observatory
• cer-vit
• cesium iodide detector
• cesium oscillator
• chain
• chain method
• chain reaction
• chamber
• Chandler term
• Chandrasekhar mean absorption coefficient
• Chandrasekhar's parametric equations of state
• change
• channel
• Chappuis bands
• characteristic curve
• characteristics
• charge
• charge coupled device
• charged particle counter
• charged particles
• charge-transfer spectrum
• chart
• CH combination line
• chemical absorption
• chemical cleaning
• chemical composition
• chemical development
• chemical element
• chemical fog
• chemically homogeneous model
• chemically inhomogeneous model
• chemical sensitization
• chemical shift
• chemical stability
• chemiluminescence
• chi-squared test
• CH line
• chlorobromide emulsion
• chondrite
• chondrule
• choosing of observatory site
• chopping
• choroid
• chorus
• Chris-cross
• Christiansen interferometer
• christmas tree
• chromatic
• chromatic aberration
• chromatic aberration of position
• chromatic adaptation
• chromatic difference of magnification
• chromatic distortions
• chromatic image
• chromaticity coefficients
• chromatic sensitization
• chromatism
• chromosphere
• chromospheric
• chromospheric facula
• chromospheric feature
• chromospheric fine structure
• chromospheric flare
• chromospheric grid
• chromospheric magnetic field
• chromospheric matter
• chromospheric net
• chromospheric phenomenon
• chromospheric reticle
• chromospheric spicules
• chromospheric striation
• chromospheric telescope
• chromospheric temperature
• chromospheric texture
• chronograph
• chronograph reading
• chronograph record
• cinecamera
• cine camera
• cinefilm
• cine film
• cinematography
• cinephotography
• circle
• circle division
• circle flexure
• circle micrometer
• circle microscope
• circle of altitude
• circle of least confusion
• circuit
• circular
• circular aperture
• circular array
• circular formations
• circular frequency
• circular Gaussian brightness distribution
• circular graduated scale
• circular image
• circularly polarized
• circularly polarized radiation
• circularly polarized radio waves
• circular micrometer
• circular orbit
• circular polarization
• circular scale
• circular speed
• circular velocity
• circumhorizontal arc
• circumlunar rocket
• circumnavigation
• circumplanetary orbit
• circumplanetary space
• circumpolar
• circumpolar constellation
• circumpolar orbit
• circumpolar region
• circumpolar stars
• circumsolar
• circumsolar orbit
• circumstellar
• circumstellar envelope
• circumstellar space
• circumterrestrial space
• circumzenithal arc
• cirrus
• cirrus clouds
• civil date
• civil day
• civilization
• civil time
• civil twilight
• civil year
• Clairaut condition
• clamp
• clam shell dome
• class
• class 1 sources
• class 2 sources
• classical astronomy
• classical damping constant
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• classical electron radius
• classical radiation theory
• classical theory
• classification
• classification method
• classification of stars
• classification of stellar spectra
• class III flare
• class of flare
• cleaning
• clearance
• clear night
• clear sky
• cleft
• cliff interference method
• cliff interferometer
• climate
• clock
• clock correction
• clock drive
• clock rate
• clock star
• clockwise
• clockwise direction
• clockwork drive
• close agreement
• close approach
• close binaries
• close binary stars
• close binary system
• close circumpolar stars
• closed shell
• closed tube
• closely coupled states
• close pair
• cloud
• cloud chamber
• cloud complex
• cloud cover
• cloud effect
• cloud F
• cloudiness
• cloudless
• cloudless sky
• cloudlike F
• cloud of comets
• cloud of extra galactic nebulae
• cloudy
• cluster
• cluster Cepheids
• clustering
• clustering of galaxies
• cluster of galaxies
• cluster of nebulae
• cluster-type stars
• cluster variables
• coalsack
• coal sack
• coarse-grain
• coarse-grained
• coarse-grain emulsion
• coarse grating
• coarse mottles
• coarse structure
• coated
• coated mirror
• coating
• cocoon stars
• coded array mask
• coded disk
• coefficient
• coefficient of thermal expansion
• coefficients in perturbations
• coefficients of metric
• coelostat
• coherence
• coherence bandwidth
• coherence interval
• coherence length
• coherent
• coherent detection spectroscopy
• coherent emission
• coherent light
• coherent scattering
• coincidence detector
• coior difference
• colatitude
• cold camera
• cold emission
• collapse
• collecting area
• collecting lens
• collecting surface
• collector lens
• colliding galaxies
• collimate
• collimating device
• collimating lens
• collimating mirror
• collimating telescope
• collimation
• collimation constant
• collimation error
• collimation of telescope
• collimation plane
• collimator
• collimator beam
• collimator mirror
• collimator objective
• collimator pier
• collimator slit
• Collinder catalog
• collinear array
• collision
• collisional broadening
• collisional damping
• collisional effect
• collisional frequency
• collisional ionization
• collisional process
• collisional radio source
• collision broadening
• collision damping
• collision diameter
• collision excitation
• collision frequency
• collision hypothesis
• collision-induced spectrum
• collision ionization
• collision of nebulae
• collodion emulsion
• color
• coloration
• color balance
• color-blind
• color coding
• color-color diagram
• color component
• color correction
• color development
• color distortions
• colored glass
• colored image
• color effect
• color equation
• color equivalent
• color excess
• color film
• color filter
• color image
• colorimeter
• colorimetric
• colorimetry
• color index
• color-luminosity correlation
• color-luminosity diagram
• color-magnitude diagram
• color-magnitude plot
• color matcher
• color measurements
• color-mixture curve
• color perception
• color photograph
• color photography
• color picture
• color response
• color-sensitive
• color sensitivity
• color sensitization
• color sequence
• color temperature
• color threshold
• color vision
• colour
• column
• column diameter
• column of ionization
• column of unit cross sectional area
• colure
• coma
• coma corrector
• coma pattern
• combination band
• combination defect
• combination difference
• combination principle
• combination relation
• combination term
• combination vibration
• combined magnitude
• comet
• cometacy spectrum
• cometary
• cometary meteors
• cometary nebula
• cometary nucleus
• cometary orbit
• cometary origin
• comet catalogue
• comet constitution
• comet family
• comet filter
• comet finder
• comet group
• comet head
• comet-hunter
• comet nomenclature
• cometocentric coordinates
• comet orbit
• comet physics
• comet seeker
• comet tail
• common active prominence
• common center of gravity
• common eruptive prominence
• communication
• communication satellite
• companion
• companion galaxy
• comparative effective area
• comparative exposure
• comparator
• comparison beam
• comparison frequency
• comparison image device
• comparison lamp
• comparison resistor
• comparison spectrum
• comparison star
• compass
• compass points
• compass variation
• compensated-truss structure
• compensation
• compensation apparatus
• compensation colorimeter
• compensator
• compiled fundamental star catalogue
• complete absorption
• complete circuit
• completely bound atom
• completely polarized
• completely steerable paraboloid reflector
• complete-sky coverage
• complete synchrone
• complex
• complex group
• complex spectrum
• complex spot
• component
• component color
• component components of galactic emission
• component E-component
• components of cosmic radiation
• components of radio source
• components of solar radio emission
• component stars
• component velocities
• composite lens
• composition
• compound eyepiece
• compound field flattener
• compounding developer
• compound interferometer
• compound lens
• compression
• compression of geoid
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