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2155 "A"

against a background
Abastumani astrophysical observatory
Seidel aberration
aberration(al) ellipse
aberration angle
aberration constant
aberration-free objective
aberration image
aberration in declination
aberration in ecliptic longitude
aberration in latitude
aberration in right ascension
aberration of light
chromatic aberration of position
optical aberrations
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
spectroscopic 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
selective absorber
absorbing capacity
absorbing cloud
absorbing layer
absorbing medium
absorbing power
absorbing region
absorbing wedge
21-cm line absorption
absorption, atmospheric
absorption band
absorption band progression
absorption beyond the series limit
stellar absorption coefficient
Balmer absorption continuum
absorption edge
absorption effects
absorption feature
absorption flocculus
absorption limiting frequency
absorption line
overlap of absorption lines
absorption loss
absorption mechanism
dark (absorption) nebula
absorption power
absorption process
absorption profile
absorption spectrum
absorption tube method
absorption water cell
absorptive power
absorptive process
absorptivity
oxygen abundance
abundance broadening
abundance classification
abundance of elements
abundance of isotopes
equinox of a catalogue
terrestrial acceleration
acceleration due to gravity
acceleration factor
auroral acceleration mechanism
acceleration of expansion
acceleration of gravity
acceleration radiation
acceleration vector
accelerometer
frequency acceptance band
acceptor
accessories
accessory drive
accidental degeneracy
accidental error
accidental perturbation
accidental predissociation
accidental symmetric top
accidental variations
accommodation
gaseous accretion
accumulated error
tracking accuracy
achondrite
modified achromat eyepiece
achromatic
achromatic doublet
achromatic lens
achromatic Ramsden eyepiece
achromatic system
achromatism
achromatize
acid fixing bath
to move in a circular orbit
against a continuous emission background
acoustical wave
arm of a cross
transit across the disk of the Sun
brightness distribution across the source
brightness distribution across the Sun
particular act
actinic
actinic rays
actinides
actinism
actinogram
actinograph
actinometer
actinometric
actinometry
actinoscope
quantum of action
activation
activation energy
active atmospheric compensation
active center
magnetically active days
active optics
active parsecs
active photospherlc region
common active prominence
solar active region
active stream
active Sun
active support
Raman active vibration
active volcano
principal source of decameter activity
solar activity index
actual antenna
actual aperture
actual area
actual position
actual pressure gradient
visual acuity
remnants of the supernova of A. D.
Adams-Russell phenomenon
dark 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
slit-width adjusting screw
threshold adjustment
National Aeronautic and Space Administration
variable-speed R. A. drive
star of advancing spectral type
telephoto advantage
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
pencil-beam (aerial) system
interferometer aerial system
aerial telescope
aerial temperature
aerial temperature distribution
aerial terminals
aerodynamic drag
aerolite
National Aeronautic and Space Administration
aerosiderite
aerosiderolite
aerosol
electron affinity
afocal imaging
afocal optics
South African astronomical observatory
South African large telescope
after-effect
afterglow
after image
against a background
against a continuous emission background
supposed age
age-dating
age-figure tests
European Space Agency
age of the universe
aggregate
aggregation
effect of aging
geomagnetic agitation
rough agreement
free-burning dc arc in air
air band spectrum
air blanket
observation airborne observation
airborne photography
aircraft trail
air current
air-driven
air glow
twilight airglow
airglow excitation
airglow spectrum
air-leg
airless
terrestrial air mass
zero air-mass solar spectral irradiation curve
air-operated
air path
air-powered
air Schmidt
air showers
air-tyred
air wavelength
Airy disk
Airy transit circle
radio-frequency albedo
albedometer
Alfven waves
Algol
Algol binary
Algol star
Algonquin telescope
aliasing
alidad(e)
alidade
alignment
inverted (alkali) doublet
alkali-earth metals
alkali elements
alkali-line spectrum
alkali metals
alkali(ne)-earth elements
alkaline earth-like spectrum
van Allen belts
belt Jupiter's van Allen type belts
radio astronomy allocation
allowance
allowance for...
allowed orbit
allowed spectrum line
allowed transition
to allow for...
aluminium alloy
all-purpose observatory
all-sky camera
all-sky coverage
Nautical almanac
nautical almanac(k)
almucantar
almukantar
along the line of sight
geocentric (al) orbit
α2 Canum Venaticorum variables
() α2
Lyman alpha detector
Lyman alpha line
α-particles
alpha particles
α-
altazimuth
altazimuth coordinates
altazimuth mounting
altazimuth reflector
altazimuth telescope
alt-az telescope mounting
multiplicity alteration
intensity alternation
alternation law of multiplicities
circle of altitude
altitude axis
altitude-azimuth mounting
high altitude nuclear explosion
altitude of North Pole
Calar Alto observatory
aluminium alloy
aluminium film
aluminium reflectivity
aluminizing
aluminizing chamber
aluminizing tank
during a lunation
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
maser amplifier
amplifier-rectifier
fringe amplitude
visibility amplitude function
amplitude grating
spectrograph interferometric with selective amplitude modulation
amplitude of variation
analemma
analogue computer
analyser
frequency analysis
image reduction and analysis facility
fine analysis method
Zeeman analyzer
analyzing spectroscope
anastigmatic lens
anastigmatic optics
image reduction and analysis facility
Particle Physics and Astronomy Research Council
storm and burst component
noise storm and bursts
ball and claw mounting
Catalog of Galaxies and clusters of Galaxies
H and D curve
H and K lines
rack and pinion focuser
declination and right ascension
law of Bunsen and Roscoe
Mount Stromlo and Siding springs observatory
National Aeronautic and Space Administration
ventilation and temperature-control system
black and white film
worm and worm-wheel drive
resolution of a nebula
guiding correction in hour angle
position angle effect
ultra-wide angle eyepiece
angle measurements
effective solid angle of antenna
angle of diffraction
angle of dip
angle of dispersion
apparent angle of elevation
angle of emergency
angle of incidence
angle of minimum deviation
angle of refraction
small angle relationships
range of phase angles
Anglo-Australian observatory
Anglo-Australian telescope
angstrom
Angstrom band
Angstrom unit
angular accuracy
angular aperture
Sun's mean 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
precession of angular momentum
mean angular motion
angular position
angular power spectrum
angular precision
angular radius
angular rate of rotation
angular resolution
Center for High Angular Resolution Astronomy
angular resolving power
angular scale
angular scattering law
angular scintillation
angular separation
angular separation of fringes
equivalent 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
general annual precession
total annual proper motion
annual variation
annular
annular aperture
annular eclipse
annularity
annular micrometer
annular phase
per annum
to train on to an object
focusing anode
refraction anomalies
anomalistic
anomalistic month
anomalistic period
anomalistic year
anomalous absorption
anomalous coupling
anomalous dispersion
anomalous g-Value
anomalous intensity
anomalous Zeeman effect
Wood's anomaly
antalgol star
antapex
antapices
Antarctic Circle
Yagi antenna
antenna area
antenna array
antenna base line
antenna beam
antenna beamwidth
antenna diagram
antenna directivity
antennae
antenna efficiency
feed antenna feed
antenna feeder
antenna gain
antenna line
antenna pattern
antenna relation
antenna resolving power
array of Yagi antennas
antenna sensitivity
antenna separation
antenna simple antenna
antenna smoothing
antenna spacing
antenna specification
antenna spillover
interferometer antenna system
antenna tapering
antenna temperature
antenna temperature distribution
antenna terminals
antenna transmission line
anterior chamber
anti-blooming
antibonding electron
antibonding orbital
galactic anticenter
anticenter direction
anticenter observations
anticenter region
anticentral
anticentral peak
anticlockwise
anticrepuscular arc
antiglow
antihalo
antimatter
anti-reflection coating
antireflection film
anti-Stokes lines
antisymmetric
antisymmetric eigenfunction
antisymmetric level
Antoniadi scale
Antu
anysotropy
Apache point observatory
apastron
aperiodic motion
un-filled aperture
aperture angle
unfilled aperture antenna
aperture diameter
aperture diaphragm
aperture effect
aperture efficiency
full aperture filter
synthetic aperture radar
aperture ratio
technique of unfilled apertures
aperture stop
aperture synthesis
aperture synthesis antenna
Cambridge optical aperture synthesis array
aperture synthesis interferometer
aperture synthesis method
aperture synthesis observations
aperture-synthesis principle
aperture-synthesis system
apex
aphelia
aphelic distance
at aphelion
aphelion distance
aphelion speed
aphelion velocity
apices
aplanat
aplanatic
aplanatic condition
aplanatic optics
aplanatic sphere
Schmidt aplanatic sphere camera
aplanatic telescope
apocenter
apochromat
apochromatic lens
apodization
at apogee
apogee distance
registering apparatus
apparatus function
apparent
apparent absorption
apparent absorption coefficient
apparent altitude
apparent angle of elevation
apparent (blackbody) disk temperature
apparent bolometric magnitude
apparent brightness
apparent celestial sphere
apparent color
apparent coordinates
apparent diameter
apparent disk
apparent elevation
apparent equinox
apparent expansion
apparent field of view
limiting apparent magnitude
apparent motion
apparent noon
apparent orbit
apparent path of the Moon
apparent photographic magnitude
apparent photored magnitude
apparent photovisual magnitude
apparent place
reduction from apparent place to mean place
apparent position
apparent radiant
apparent radiometric magnitude
apparent rotation by refraction of field
apparent sidereal time
apparent size
apparent (solar) time
apparent sunspot area
apparent temperature
apparent temperature of the Sun
apparent visual magnitude
apparition
telescopic appearance
appearance potential
Appleton layer
application of correction
applied photography
to apply correction for...
close approach
approach velocity
approximate position
Rayleigh-Jeans approximation
appulse
apse
apsidal motion
line of apsides
apsis
aqueous humor
arbitrarily polarized beam
matter of arbitrariness
minute of arc
eruptive arch
shutter arches
Hubble data archive
free-burning dc arc in air
free-burning dc arc in vacuum
arc minute
arc second
arc spectrum
Arctic Circle
effective area
area corrected for foreshortening
areal integral
areal velocity
law of areas
Aresibo radio telescope
Argelander step method
Instituto Argentino de Radioastronomia
argon
argument of perihelion
first point of Aries
Å
arm
armillary sphere
arm of a cross
bridging arm of luminous matter
arm of reflectors
new Moon in the old Moon's arms
region around the pole
two-aerial arrangement
Very large array
coded array mask
broadside array of dipoles
broadside array of half-wave dipoles
array of Yagi antennas
array of Yagis
second art collision
artificial
artificial comet
artificial Earth satellite
artificial Earth satellite program(me)
artificial gravitation
artificial gravity
artificial guide star
artificial meteor
artificial Moon satellite
artificial planet
artificial radiation belt
unmanned artificial satellite
artificial satellite orbit
artificial star
universe as a whole
ascending
longitude of the ascending node
ascending node-perihelion angle
ascending prominence
declination and right ascension
true right ascension at date
right ascension circle
relative right ascensions
volcanic ash
ashen light
Asiago observatory
aslrometric observations
aspect
aspheric
aspheric(al)
depth of asphericity
aspheric plate
assemble
slow motion drive assembly
Journal of British Astronomical Association
Association of Universities for Research in Astronomy
American Association of Variable Star Observers
assumed apex
assumed radius
asterism
asteroid
asteroidal
asteroidal meteors
asteroid belt
asteroid orbit
family of asteroids
asteroid zone
astigmatic
astigmatism
astral
astrobiology
astrobotany
astrocamera
astro-compass
astrodynamic
astrodynamics
Instituto de Astrofisica de Canarias
astrognosy
meniscus astrograph
astrographic camera
astrographic telescope
Danjon astrolabe
astrolabe observations
astrologer
astrology
astrometric
astrometric eyepiece
astrometric observatory
astrometric reflector
astrometric telescope
photographic astrometry
Astrometry division
astronaut
astronautical
astronautical objective
astronautics
astronavigation
stellar astronomer
Astronomer Royal
astronomic(al)
astronomical aberration
Journal of British Astronomical Association
astronomical body
astronomical calculations
astronomical calendar
astronomical camera
astronomical climate
astronomical clock
system of astronomical constants
astronomical coordinates
astronomical coordinate system
astronomical data
Astronomical Data Center
astronomical day
astronomical dictionary
astronomical distances
astronomical experiments
radio astronomical explorations
astronomical guiding
astronomical history
astronomical information
astronomical institute
astronomical instruments
astronomical knowledge
astronomical latitude
astronomical literature
astronomically
radio astronomical method
astronomical methods
astronomical navigation
astronomical object
astronomical observations
South African astronomical observatory
astronomical optics
astronomical parameters
astronomical phenomena
astronomical photoelectric photometry
astronomical photograph
astronomical photography
astronomical photometer
astronomical photometry
astronomical problems
astronomical quantities
astronomical radar
astronomical radar work
astronomical radio frequencies
astronomical radio waves
astronomical reference system
astronomical refraction
astronomical refractor
astronomical research
astronomical research project
astronomical satellite
astronomical scintillation
astronomical seeing
astronomical sign
astronomical societies
Royal Astronomical Society
Astronomical Society of Pacific
Publication of the Astronomical Society of the Pacific
astronomical source
astronomical spectrograph
astronomical spectrophotometry
astronomical spectroscopy
radio astronomical station
astronomical studies
astronomical symbols
astronomical tables
astronomical target
astronomical techniques
Central Bureau for Astronomical Telegrams
astronomical telescope
astronomical term
astronomical terminology
Greenwich mean astronomical time
astronomical time scale
astronomical tool
astronomical triangle
astronomical tube
astronomical twilight
International Astronomical Union
astronomical unit
astronomical universe
radio (astronomical) work
astronomical work
Observatorio Astronomico Nacional
Institut de radio astronomie millimetrique
Centre de Donnees astronomiques de Strasbourg
Center for High Angular Resolution Astronomy
radio astronomy allocation
Nuffield Radio Astronomy Laboratory
radio astronomy method
National Optical Astronomy Observatories
Mullard Radio Astronomy Observatory
radio astronomy receiver
Particle Physics and Astronomy Research Council
radio astronomy technique
astrophotography
astrophotometer
astrophotometry
astrophysical
astrophysical institute
astrophysical instruments
astrophysical observations
Smithsonian astrophysical observatory
astrophysical problems
astrophysical research
Southern astrophysical research telescope
National Center for Radio Astrophysics
Astrophysics division
astrospectroscopy
astrovelocimeter
Asundi band
stellar remnant of a supernova
asymmetrical(-class) telescope
asymmetrical distortion
asymmetrical mounting
asymmetric(al) top
asymmetric-top molecule
east-west asymmetry
Atacama large millimeter array
Cornell Atacama telescope
at aphelion
at apogee
true place at date
at full moon
at ground level
half width at half maximum
at high latitudes
at infrared
star atlas
at low latitudes
sidereal time at mean midnight
noise radiation from atmosphere
absorption, atmospheric
atmospheric absorption
atmospheric air
atmospheric(al) conditions
atmospheric attenuation
atmospheric bands
atmospheric circulation belts
active atmospheric compensation
atmospheric constituents
atmospheric corrections
atmospheric density
atmospheric depth
atmospheric diffusion coefficient
atmospheric dispersion
atmospheric dynamo
atmospheric effect
atmospheric emission
atmospheric extinction
atmospheric Fs
atmospheric heating
atmospheric lines
atmospheric O 2 band
atmospheric optics
atmospheric parameters
atmospheric perturbation
atmospheric phenomenon
atmospheric pressure
atmospheric properties
atmospheric radiation
atmospheric refraction
atmospheric refraction effects
sudden enhancement of atmospherics
atmospheric scattering
atmospheric scintillation
atmospheric seeing
atmospheric structure
atmospheric temperature
atmospheric turbulence
atmospheric window
Mars at near approach
mass of hydrogen atom
atomic
atomic absorption coefficient
atomical source
gaseous atomic-beam light source
atomic-beam method
atomic beam resonance spectroscopy
atomic clock
atomic constants
atom(ic) energy
atomic energy levels
atomic excitation
atomic fluorescence
atomic heat of formation
atomic hydrogen
atomic hydrogen emission
atomic lifetime
atomic line
atomic mass
atomic molecule
atomic multiplet
atomic nucleus
atomic number
atomic orbit
atomic orbital
atomic partition function
atomic radius
atomic spectrum
atomic state
odd atomic term
international atomic time
atomic time scale
mean atomic weight
atomic-weight unit
atom model
atom transition
at perihelion
at sea level
tracking at sidereal rate
attachment
total zenith attenuation
filter attenuation band
synodic period of rotation at the equator
at the prime focus
at the subsolar point
attract
force of attraction
attraction center
attractive force
attractive interaction
attractive potential curve
A-type star
solar aureole
aurora
aurora australis
aurora borealis
aurorae
auroral
auroral absorption
auroral acceleration mechanism
auroral arc
auroral band
auroral blackout
auroral breakup
auroral corona
auroral crown
auroral display
auroral echo
auroral emission
auroral latitude
auroral line
auroral particles
auroral primaries
auroral primary particles
auroral rays
auroral spectrum
auroral storm
auroral transitions
auroral zone
Australia telescope
aurora australis
autocollimating spectrograph
autocollimation
autocorrelation function
autocorrelator
autoexcitation
autoguider
autoionization
automatic control
automatic development
automatic drive
automatic focusing
automatic interplanetary station
automatic measuring machine
automatic observatory
automatic processing
automatic programmer
automatic recording device
automatic reversal system
automatic telescope
automatic tracking
automatic transit circle
autosyn
autumn
autumnal equinoctial point
autumnal equinox
autumnal equinox point
auxiliary apparatus
auxiliary equipment
auxiliary instrumentation
auxiliary instruments
lens auxiliary lens
auxiliary mirror
auxiliary telescope
available observations
available power
avalanche photo-diode
average
average brightness
average coefficient
average duration
average error
average intensity
average magnitude
average refraction
correction for average refraction effect
average speed
averaging
averaging time
averted hemisphere
averted side
averted vision
aviation astronomy
zone of avoidance
universe as a whole
rectangular axes
axial
axial distribution
axial inclination
axially symmetric
axially symmetric field
axially symmetric problem
axial ray
axial rotation
axial rotation period
axial spin
axial tilt
semi minor axis
crossed (axis) interferometer
cross axis mounting
two-fold axis of symmetry
polar axle
axysimmetric
Bolshoj telescop azimutalnyi
parallax in azimuth
azimuthal
azimuth(al) movement
azimuthal quantum number
azimuth axis
azimuth error
azimuth star

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