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956 "A"

• Abastumani astrophysical observatory
• aberration
• aberrational ellipse
• aberration angle
• aberration constant
• aberration ellipse
• aberration-free objective
• aberration image
• aberration in declination
• aberration in ecliptic longitude
• aberration in latitude
• aberration in right ascension
• aberration of light
• ablation
• abnormal
• abnormal galaxy
• abnormal series
• abrasive
• absolute black body
• absolute brightness
• absolute coordinates
• absolute declination
• absolute degree
• absolute determinations
• absolute line strength
• absolute luminosity
• absolute magnitude
• absolute magnitude effect
• absolute method
• absolute parallax
• absolute photographic magnitude
• absolute position
• absolute proper motion
• absolute radio magnitude
• absolute sensitivity
• absolute stellar luminosity
• absolute temperature
• absolute unit
• absolute zero
• absorb
• absorbability
• absorbed energy
• absorbed light
• absorber
• absorbing capacity
• absorbing cloud
• absorbing layer
• absorbing medium
• absorbing power
• absorbing region
• absorbing wedge
• absorption
• absorption, atmospheric
• absorption band
• absorption band progression
• absorption beyond the series limit
• absorption coefficient
• absorption edge
• absorption effects
• absorption feature
• absorption flocculus
• absorption limiting frequency
• absorption line
• absorption loss
• absorption mechanism
• absorption power
• absorption process
• absorption profile
• absorption spectrum
• absorption tube method
• absorption water cell
• absorptive power
• absorptive process
• absorptivity
• abundance
• abundance broadening
• abundance classification
• abundance of elements
• abundance of isotopes
• acceleration
• acceleration due to gravity
• acceleration factor
• acceleration of expansion
• acceleration of gravity
• acceleration radiation
• acceleration vector
• accelerometer
• acceptor
• accessories
• accessory drive
• accidental degeneracy
• accidental error
• accidental perturbation
• accidental predissociation
• accidental symmetric top
• accidental variations
• accommodation
• accretion
• accumulated error
• accuracy
• achondrite
• achromatic
• achromatic doublet
• achromatic lens
• achromatic Ramsden eyepiece
• achromatic system
• achromatism
• achromatize
• acid fixing bath
• acoustical wave
• act
• actinic
• actinic rays
• actinides
• actinism
• actinogram
• actinograph
• actinometer
• actinometric
• actinometry
• actinoscope
• activation
• activation energy
• active atmospheric compensation
• active center
• active optics
• active parsecs
• active photospherlc region
• active prominence
• active region
• active stream
• active Sun
• active support
• active volcano
• activity
• actual antenna
• actual aperture
• actual area
• actual position
• actual pressure gradient
• Adams-Russell phenomenon
• adaptation
• adapter
• adaptive optics
• adder
• adding machine
• additional mirror
• adiabate
• adiabatic
• adiabatic equilibrium
• adiabatic gas law
• adiabatic gradient
• adiabatic invariant
• adiabatic lapse rate
• adiabatic law
• adiabatic process
• adiabatic temperature gradient
• adjacent galaxies
• adjustment
• aeolosphere
• aeolosphere model
• aeolospheric
• aeolospheric model
• aerial
• aerial area
• aerial array
• aerial beam
• aerial beamwidth
• aerial camera
• aerial diagram
• aerial directivity
• aerial efficiency
• aerial feed
• aerial feeder
• aerial fog
• aerial gain
• aerial line
• aerial relation
• aerial sensitivity
• aerial separation
• aerial smoothing
• aerial spacing
• aerial survey
• aerial system
• aerial telescope
• aerial temperature
• aerial temperature distribution
• aerial terminals
• aerodynamic drag
• aerolite
• aerosiderite
• aerosiderolite
• aerosol
• affinity
• afocal imaging
• afocal optics
• after-effect
• afterglow
• after image
• against a background
• against a continuous emission background
• age
• age-dating
• age-figure tests
• agency
• age of the universe
• aggregate
• aggregation
• agitation
• agreement
• air
• air band spectrum
• air blanket
• airborne photography
• aircraft trail
• air current
• air-driven
• airglow
• air glow
• airglow excitation
• airglow spectrum
• air-leg
• airless
• air mass
• air-operated
• air path
• air-powered
• air Schmidt
• air showers
• air-tyred
• air wavelength
• Airy disk
• Airy transit circle
• albedo
• albedometer
• Alfven waves
• Algol
• Algol binary
• Algol star
• Algonquin telescope
• aliasing
• alidad
• alidade
• alignment
• alkali-earth elements
• alkali-earth metals
• alkali elements
• alkali-line spectrum
• alkali metals
• alkaline-earth elements
• alkaline earth-like spectrum
• allowance
• allowance for...
• allowed orbit
• allowed spectrum line
• allowed transition
• alloy
• all-purpose observatory
• all-sky camera
• all-sky coverage
• almanac
• almanack
• almucantar
• almukantar
• along the line of sight
• alpha particles
• altazimuth
• altazimuth coordinates
• altazimuth mounting
• altazimuth reflector
• altazimuth telescope
• alt-az telescope mounting
• alteration
• alternation law of multiplicities
• altitude
• altitude axis
• altitude-azimuth mounting
• altitude of North Pole
• aluminium alloy
• aluminium film
• aluminium reflectivity
• aluminizing
• aluminizing chamber
• aluminizing tank
• AMANDA neutrino detector
• amateur astronomer
• amateur astronomy
• amateur observations
• amateur telescope
• ambient light illumination
• ambient temperature
• ambiguity
• American Association of Variable Star Observers
• American Astronomical Society
• ametropic eye
• amidol developer
• ammonia
• ammonium dihydrogen phosphat
• amount of polarization
• amplification
• amplification coefficient
• amplification factor
• amplifier
• amplifier-rectifier
• amplitude
• amplitude grating
• amplitude of variation
• analemma
• analogue computer
• analyser
• analysis
• analyzer
• analyzing spectroscope
• anastigmatic lens
• anastigmatic optics
• angle
• angle measurements
• angle of diffraction
• angle of dip
• angle of dispersion
• angle of elevation
• angle of emergency
• angle of incidence
• angle of minimum deviation
• angle of refraction
• Anglo-Australian observatory
• Anglo-Australian telescope
• angstrom
• Angstrom band
• Angstrom unit
• angular accuracy
• angular aperture
• angular diameter
• angular diameter measurement
• angular dimensions
• angular discrimination
• angular dispersion
• angular displacement
• angular distance
• angular distribution
• angular distribution of sources
• angular estimate
• angular extent
• angular field of view
• angular frequency
• angular information
• angular light-distribution
• angular magnification
• angular measurement
• angular momentum
• angular position
• angular power spectrum
• angular precision
• angular radius
• angular rate of rotation
• angular resolution
• angular resolving power
• angular scale
• angular scattering law
• angular scintillation
• angular separation
• angular separation of fringes
• angular size
• angular size work
• angular structure
• angular variation
• angular velocity
• anharmonicity
• anharmonicity constant
• anharmonic vibrator
• anisotropic
• anisotropic particles
• anisotropic plasma
• anisotropy
• annealing
• annihilation
• annual
• annual aberration
• annual anomaly
• annual motion
• annual parallax
• annual precession
• annual proper motion
• annual variation
• annular
• annular aperture
• annular eclipse
• annularity
• annular micrometer
• annular phase
• annum
• anode
• anomalistic
• anomalistic month
• anomalistic period
• anomalistic year
• anomalous absorption
• anomalous coupling
• anomalous dispersion
• anomalous g-Value
• anomalous intensity
• anomalous Zeeman effect
• anomaly
• antalgol star
• antapex
• antapices
• Antarctic Circle
• antenna
• antenna area
• antenna array
• antenna base line
• antenna beam
• antenna beamwidth
• antenna diagram
• antenna directivity
• antennae
• antenna efficiency
• antenna feeder
• antenna gain
• antenna line
• antenna pattern
• antenna relation
• antenna resolving power
• antenna sensitivity
•