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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