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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