A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
21 CM LINE      (21CmLine)
twenty one cm line RADIO RECOMBINATION LINES H I ABSORPTION ,
H I CLOUDS ,
H I CONTENT ,
H I EMISSION ,
H I REGIONS ,
NEUTRAL HYDROGEN
 
53 PERSEI STARS      (53PerseiStars)
B STARS ,
PULSATING VARIABLE STARS
 
ABELL CLUSTERS      (AbellClusters)
CLUSTERS OF GALAXIES
 
ABERRATION      (Aberration)
ASTROMETRY ,
COORDINATE SYSTEMS
Of starlight.
 
ABERRATIONS      (Aberrations)
ASTIGMATISM ,
CHROMATIC ABERRATION ,
COMA ,
DISTORTION ,
FIELD CURVATURE ,
SPHERICAL ABERRATION 		FOCUS ,
LENSES ,
MIRRORS ,
OPTICAL SYSTEMS ,
OPTICS ,
TELESCOPES
Of optical images
 
ABLATION      (Ablation)
METEORITES
 
ABNORMAL SPECTRA      (AbnormalSpectra)
PECULIAR STARS
 
ABSOLUTE MAGNITUDE      (AbsoluteMagnitude)
MAGNITUDES DISTANCE ,
DISTANCE MODULUS ,
HERTZSPRUNG RUSSELL DIAGRAM ,
LUMINOSITY ,
WILSON BAPPU EFFECT
 
ABSOLUTE TEMPERATURE SCALE      (AbsoluteTemperatureScale)
TEMPERATURE SCALES CELSIUS TEMPERATURE SCALE ,
KELVIN ,
TEMPERATURE
 
ABSORPTION      (Absorption)
ATMOSPHERIC EXTINCTION ,
INTERGALACTIC ABSORPTION ,
INTERSTELLAR ABSORPTION ,
LIGHT ABSORPTION 		ATMOSPHERIC SCATTERING ,
ATMOSPHERIC WINDOWS ,
CAPTURE ,
EQUIVALENT WIDTHS ,
INTERSTELLAR GAS ,
OPACITY ,
PHOTODISSOCIATION ,
PHOTOIONIZATION ,
RADIATION ,
RADIATIVE EQUILIBRIUM ,
REDDENED STARS ,
REDDENING ,
ROSSELAND OPACITY ,
TRANSMISSION
Combine with other terms
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ABSORPTION COEFFICIENT      (AbsorptionCoefficient)
absorptivity ATMOSPHERIC EXTINCTION ,
EINSTEIN COEFFICIENT ,
INTERGALACTIC ABSORPTION ,
INTERSTELLAR ABSORPTION ,
OPTICAL DEPTH ,
TRANSPARENCY
 
ABSORPTION LINES      (AbsorptionLines)
SPECTRAL LINES ATOMIC PROCESSES ,
BOUND FREE TRANSITIONS ,
CALCIUM LINES ,
CYANOGEN LINES ,
LINE FORMATION ,
LINE IDENTIFICATIONS ,
LINE PROFILES ,
LINE RATIOS ,
LYMAN ALPHA FOREST ,
METAL LINES ,
MICROTURBULENCE ,
RESIDUAL INTENSITY ,
SPECTRA ,
SPECTROSCOPIC ANALYSIS ,
VOIGT PROFILES
 
ABSORPTION SPECTRA      (AbsorptionSpectra)
LINE SPECTRA ,
SPECTRA 		ATOMIC SPECTRA BALMER SERIES ,
BOUND FREE TRANSITIONS ,
D LINES ,
ENERGY SPECTRA ,
FRAUNHOFER LINES ,
RAMAN EFFECT
 
ABSORPTION SPECTROSCOPY      (AbsorptionSpectroscopy)
SPECTROSCOPY
 
ABUNDANCE      (Abundance)
chemical abundance ,
element abundance ,
stellar abundance 		COSMIC ABUNDANCE ,
ISOTOPIC ABUNDANCE ,
METAL ABUNDANCE 		ABUNDANCE RATIOS ,
CHEMICAL COMPOSITION ,
CHEMICAL ELEMENTS ,
CHEMICAL EVOLUTION ,
CNO ANOMALIES ,
CURVES OF GROWTH ,
ELEMENT FORMATION ,
HEAVY ELEMENTS ,
HELIUM POOR STARS ,
HELIUM RICH STARS ,
PECULIAR STARS ,
RARE EARTHS
May be combined with elements, e.g. helium abundance
 
ABUNDANCE RATIOS      (AbundanceRatios)
ABUNDANCE ,
CNO ANOMALIES
 
ACCELERATION      (Acceleration)
KINEMATICS DECELERATION ,
GRAVIMETRY ,
ORBITAL ELEMENTS ,
ORBITS
 
ACCRETION      (Accretion)
ACCRETION DISKS ,
ALFVEN SURFACE ,
BINARY STARS ,
MASS TRANSFER ,
PARTICLE ACCRETION
 
ACCRETION DISKS      (AccretionDisks)
DISKS ACCRETION ,
BLACK HOLES ,
CIRCUMSTELLAR DISKS ,
CLOSE BINARY STARS ,
COOLING FLOWS ,
STELLAR WINDS ,
U GEMINORUM STARS
 
ACHONDRITES      (Achondrites)
CHONDRITES ,
METEORITES
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ACOUSTICS      (Acoustics)
ACOUSTIC WAVES
 
ACOUSTIC WAVES      (AcousticWaves)
sound ,
sound waves 		WAVES ACOUSTICS ,
GRAVITY WAVES ,
SPEED OF SOUND ,
WAVELENGTH
 
ACTIVE GALACTIC NUCLEI      (ActiveGalacticNuclei)
agn GALACTIC NUCLEI ,
VARIABLE SOURCES ,
X RAY SOURCES 		BLAZARS ,
SEYFERT NUCLEI 		ACTIVE GALAXIES ,
BL LACERTAE OBJECTS ,
COMPACT NUCLEI ,
EMISSION LINE GALAXIES ,
GALAXIES ,
QUASARS ,
RADIO GALAXIES
 
ACTIVE GALAXIES      (ActiveGalaxies)
eruptive galaxies GALAXIES ,
X RAY SOURCES 		ACTIVE GALACTIC NUCLEI ,
COMPACT GALAXIES ,
EMISSION LINE GALAXIES ,
X RAY FLARES
 
ACTIVE OPTICS      (ActiveOptics)
OPTICS ADAPTIVE OPTICS ,
ATMOSPHERIC REFRACTION ,
MULTIPLE MIRROR TELESCOPES ,
SEEING ,
TIP TILT MIRRORS
 
ACTIVE PROMINENCES      (ActiveProminences)
PROMINENCES
 
ACTIVE STARS      (ActiveStars)
EMISSION LINE STARS ,
X RAY STARS 		X RAY FLARES
 
ACTIVE SUN      (ActiveSun)
FLARES ,
QUIET SUN ,
SOLAR ACTIVITY ,
SOLAR CYCLE ,
SUNSPOTS
 
ACTIVITY INDEXES      (ActivityIndexes)
SOLAR ACTIVITY
 
ADAPTION      (Adaption)
Combine with other terms
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ADAPTIVE OPTICS      (AdaptiveOptics)
OPTICS ACTIVE OPTICS ,
ATMOSPHERIC REFRACTION ,
SEEING ,
SEGMENTED OPTICS
 
ADIABATIC PROCESS      (AdiabaticProcess)
ENERGY TRANSFER ,
THERMODYNAMICS
 
ADJUSTMENT      (Adjustment)
ALIGNMENT [OPTICS] ,
COLLIMATION ,
CORRECTIONS ,
OPTICS ,
ORIENTATION
Combine with other terms
 
ADSORPTION      (Adsorption)
DUST GRAINS ,
INTERPLANETARY GRAINS ,
INTERSTELLAR DUST
Combine with other terms
 
A DWARF STARS      (ADwarfStars)
A STARS ,
DWARF STARS 		A SUBDWARF STARS
 
AEROLITES      (Aerolites)
METEORITES
 
AERONOMY      (Aeronomy)
ATMOSPHERES ,
EARTH ATMOSPHERE ,
PLANETS
 
Ae STARS      (AeStars)
herbig stars A STARS ,
EARLY TYPE EMISSION STARS 		Be STARS
 
AFTERGLOW      (Afterglow)
ATMOSPHERIC RADIATION LIGHT SCATTERING ,
LUMINESCENCE
 
AGE      (Age)
HUBBLE TIME ,
RELAXATION TIME ,
TURNOFF POINT
Combine with other terms
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
A GIANT STARS      (AGiantStars)
A STARS ,
GIANT STARS
 
AIR      (Air)
GASES ATMOSPHERES
 
AIR CONDITIONING      (AirConditioning)
TEMPERATURE CONTROL ,
VENTILATION
 
AIRGLOW      (Airglow)
dayglow ,
nightglow 		ATMOSPHERIC RADIATION ASHEN LIGHT ,
AURORAS ,
NIGHT SKY BRIGHTNESS ,
RADIATIVE RECOMBINATION ,
RAYLEIGH SCATTERING ,
SKY BRIGHTNESS
 
AIRPLANE BORNE INSTRUMENTS      (AirplaneBorneInstruments)
BALLOON BORNE INSTRUMENTS ,
GROUND BASED ASTRONOMY ,
INFRARED OBSERVATORIES ,
ROCKET BORNE INSTRUMENTS ,
SATELLITE BORNE INSTRUMENTS
 
AIR POLLUTION      (AirPollution)
POLLUTION LIGHT POLLUTION ,
SITE PROTECTION
 
AIRY DISKS      (AiryDisks)
DIFFRACTION
 
ALBEDO      (Albedo)
spherical albedo OPTICAL PROPERTIES ILLUMINATION ,
RADIATION ,
REFLECTION ,
SURFACE PROPERTIES
 
ALFVEN SURFACE      (AlfvenSurface)
ACCRETION ,
NEUTRON STARS
 
ALGOL VARIABLE STARS      (AlgolVariableStars)
beta persei stars BINARY STARS ,
ECLIPSING BINARY STARS 		W URSAE MAJORIS STARS
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ALIGNMENT [OPTICS]      (AlignmentOptics)
ADJUSTMENT ,
COLLIMATION ,
CORRECTIONS ,
ORIENTATION
Of optical images
 
ALIGNMENT [PLANETS]      (AlignmentPlanets)
CELESTIAL MECHANICS ,
PLANETS ,
SOLAR SYSTEM
Of planets, etc
 
ALL SKY CAMERAS      (AllSkyCameras)
CAMERAS ,
WIDE FIELD TELESCOPES 		ALL SKY PHOTOGRAPHY ,
WIDE ANGLE LENSES
 
ALL SKY PHOTOGRAPHY      (AllSkyPhotography)
PHOTOGRAPHY ALL SKY CAMERAS ,
CAMERAS ,
WIDE ANGLE LENSES
 
ALMANACS      (Almanacs)
EPHEMERIDES
 
ALPHA2 CANUM VENATICORUM STARS      (Alpha2CanumVenaticorumStars)
CATACLYSMIC VARIABLE STARS ,
ERUPTIVE BINARY STARS ,
MAGNETIC VARIABLE STARS 		SX ARIETIS STARS Ap STARS ,
SPECTRUM VARIABLE STARS
 
ALPHA PARTICLES      (AlphaParticles)
BOSONS ,
COMPOSITE PARTICLES ,
NUCLEAR RADIATION ,
PARTICLES 		ELECTRONS ,
NEUTRONS ,
PROTONS ,
RADIOACTIVITY
 
ALTAZIMUTH MOUNTING      (AltazimuthMounting)
azimuth mounting TELESCOPE MOUNTINGS ALTITUDE [ANGLE] ,
AZIMUTH ,
EQUATORIAL MOUNTING ,
HORIZON COORDINATE SYSTEM ,
SIDEROSTATS ,
VERTICAL CIRCLES
 
ALTIMETERS      (Altimeters)
MEASURING INSTRUMENTS
 
ALTIMETRY      (Altimetry)
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ALTITUDE [ANGLE]      (AltitudeAngle)
elevation angle ALTAZIMUTH MOUNTING ,
AZIMUTH ,
HORIZON ,
HORIZON COORDINATE SYSTEM ,
SEXTANTS ,
ZENITH DISTANCE
Use for angle; see ELEVATION for height.
 
ALUMINIZING      (Aluminizing)
ALUMINUM COATINGS ,
MIRRORS ,
VACUUM TECHNIQUES
 
ALUMINUM COATINGS      (AluminumCoatings)
aluminium coatings COATINGS ,
THIN FILMS 		ALUMINIZING ,
MIRRORS ,
SILVER COATINGS ,
SURFACES [OPTICAL] ,
VACUUM TECHNIQUES ,
VAPOR DEPOSITION
 
AMATEUR ASTRONOMY      (AmateurAstronomy)
ASTRONOMERS ,
ASTRONOMICAL RESEARCH
 
AM CANUM VENATICORUM STARS      (AmCanumVenaticorumStars)
CATACLYSMIC VARIABLE STARS ,
ERUPTIVE BINARY STARS ,
HYDROGEN DEFICIENT STARS 		U GEMINORUM STARS
 
AM HERCULIS STARS      (AmHerculisStars)
polars CLOSE BINARY STARS
 
AMMONIA      (Ammonia)
INTERSTELLAR MOLECULES
 
AMOR GROUP      (AmorGroup)
MINOR PLANET FAMILIES APOLLO GROUP ,
TROJAN GROUP
 
AMPLIFIERS      (Amplifiers)
PARAMETRIC AMPLIFIERS ,
PREAMPLIFIERS 		IMAGE TUBES ,
PHOTOMULTIPLIER TUBES ,
PULSE COUNTERS ,
PULSE COUNTING
 
AMPLITUDES      (Amplitudes)
DECAY [OSCILLATIONS] ,
MAGNITUDES ,
OSCILLATIONS ,
PULSATIONS ,
VARIABLE STARS ,
VIBRATION
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
Am STARS      (AmStars)
A STARS ,
MAGNETIC STARS ,
MAGNETIC VARIABLE STARS ,
METAL RICH STARS 		SPECTRUM VARIABLE STARS
 
ANALOG RECORDERS      (AnalogRecorders)
DATA STORAGE
 
ANALYSES      (Analyses)
DATA ANALYSIS ,
FINE ANALYSES ,
SIGNAL ANALYSIS ,
SIGNAL PROCESSING 		ASTRONOMICAL TECHNIQUES ,
QUANTIZATION ,
REDUCTION METHODS
Combine with other terms
 
ANGLE OF REFRACTION      (AngleOfRefraction)
ATMOSPHERES ,
ZENITH DISTANCE
In earth's atmosphere
 
ANGULAR DIAMETERS      (AngularDiameters)
apparent diameters DIAMETERS INTERFEROMETRY ,
OCCULTATIONS ,
SPECKLE INTERFEROMETRY
 
ANGULAR MOMENTUM      (AngularMomentum)
G FACTOR ,
KINEMATICS ,
MOMENTUM ,
ROTATION
 
ANGULAR RESOLUTION      (AngularResolution)
RESOLUTION ANGULAR SEPARATION ,
BEAMWIDTH ,
OPTICS ,
SPECKLE INTERFEROMETRY
 
ANGULAR SEPARATION      (AngularSeparation)
angular distance ANGULAR RESOLUTION ,
OPTICAL DOUBLE STARS ,
SPECKLE INTERFEROMETRY
 
ANGULAR VELOCITY      (AngularVelocity)
VELOCITY CELESTIAL MECHANICS ,
ORBITAL VELOCITY ,
ROTATION
 
ANISOTROPY      (Anisotropy)
BACKGROUND RADIATION ,
ISOTROPY ,
POLARIZATION [CHARGE SEPARATION]
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ANNUAL EQUATION      (AnnualEquation)
EARTH MOON SYSTEM ,
EARTH ORBIT ,
ELLIPTICAL ORBITS
 
ANNUAL PARALLAX      (AnnualParallax)
heliocentric parallax PARALLAXES ASTRONOMICAL UNIT
 
ANNULAR ECLIPSES      (AnnularEclipses)
ECLIPSES TOTAL ECLIPSES
 
ANOMALIES      (Anomalies)
GRAVITY ANOMALIES ,
MAGNETIC ANOMALIES
 
ANOMALISTIC MONTH      (AnomalisticMonth)
ANOMALY ,
MOON
 
ANOMALISTIC YEAR      (AnomalisticYear)
YEAR ANOMALY
 
ANOMALY      (Anomaly)
apparent anomaly ,
eccentric anomaly ,
mean anomaly ,
real anomaly ,
true anomaly 		ORBITAL ELEMENTS ANOMALISTIC MONTH ,
ANOMALISTIC YEAR
 
ANSAE      (Ansae)
LENTICULAR GALAXIES ,
PLANETARY NEBULAE ,
RINGS
 
ANTAPEX      (Antapex)
APEX ,
SOLAR MOTION
 
ANTARCTIC OBSERVATORIES      (AntarcticObservatories)
OBSERVATORIES
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ANTENNA DESIGN      (AntennaDesign)
POLAR DIAGRAM ,
RADIO TELESCOPES
 
ANTENNAS      (Antennas)
aerials RADAR EQUIPMENT CASSEGRAIN ANTENNAS ,
DIPOLE ANTENNAS ,
HORN ANTENNAS ,
LENS ANTENNAS ,
MICROWAVE ANTENNAS ,
MILLS CROSS ANTENNAS ,
PARABOLIC ANTENNAS ,
RADIO ANTENNAS ,
REFLECTOR ANTENNAS ,
YAGI ANTENNAS 		ARRAYS ,
CURRENT SHEETS ,
CURRENTS ,
DISH ANTENNAS ,
FEED HORNS ,
INTERFEROMETERS ,
RADAR ,
RADIO TELESCOPES ,
TELESCOPES
 
ANTHROPIC PRINCIPLE      (AnthropicPrinciple)
COSMOLOGY ,
LIFE
 
ANTIMATTER      (Antimatter)
ANTIPARTICLES
 
ANTINEUTRINOS      (Antineutrinos)
ANTIPARTICLES NEUTRINOS
 
ANTINODES      (Antinodes)
VIBRATION
 
ANTINUCLEONS      (Antinucleons)
ANTIPARTICLES
 
ANTIPARTICLES      (Antiparticles)
ANTIMATTER ,
ELEMENTARY PARTICLES 		ANTINEUTRINOS ,
ANTINUCLEONS ,
ANTIPROTONS ,
POSITRONS
 
ANTIPROTONS      (Antiprotons)
ANTIPARTICLES PROTONS
 
ANTIREFLECTION COATINGS      (AntireflectionCoatings)
COATINGS ,
OPTICAL FILMS ,
THIN FILMS 		LENSES ,
SURFACES [OPTICAL]
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
APASTRON      (Apastron)
APSIDES PERIASTRON
 
APERIODIC COMETS      (AperiodicComets)
COMETS
 
APERTURES      (Apertures)
APERTURE SYNTHESIS ,
APODIZATION ,
OPTICAL SYSTEMS
 
APERTURE SYNTHESIS      (ApertureSynthesis)
grading function ,
synthetic aperture 		APERTURES ,
GRATING RING ,
INTERFEROMETRY ,
VISIBILITY FUNCTION
 
APEX      (Apex)
ANTAPEX ,
SOLAR MOTION
 
APHELION      (Aphelion)
APSIDES EARTH ORBIT ,
PERIHELION ,
PLANETS
 
APOCENTER      (Apocenter)
BINARY STARS
 
APODIZATION      (Apodization)
APERTURES ,
RADIO TELESCOPES
 
APOGEE      (Apogee)
APSIDES MOON ,
PERIGEE
 
APOLLO GROUP      (ApolloGroup)
MINOR PLANET FAMILIES AMOR GROUP ,
HIRAYAMA FAMILIES ,
TROJAN GROUP
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
APPARENT INTENSITY      (ApparentIntensity)
INTENSITY
 
APPARENT MAGNITUDES      (ApparentMagnitudes)
MAGNITUDES B MAGNITUDE ,
H MAGNITUDE ,
I MAGNITUDE ,
J MAGNITUDE ,
K MAGNITUDE ,
L MAGNITUDE ,
M MAGNITUDE ,
N MAGNITUDE ,
O MAGNITUDE ,
P MAGNITUDE ,
PHOTOELECTRIC MAGNITUDES ,
PHOTOGRAPHIC MAGNITUDES ,
PHOTOVISUAL MAGNITUDES ,
Q MAGNITUDE ,
R MAGNITUDE ,
U MAGNITUDE ,
V MAGNITUDE 		PHOTOMETRIC SYSTEMS ,
PHOTOMETRY
 
APPARENT POSITIONS      (ApparentPositions)
apparent places POSITIONS ASTROMETRY ,
TRUE POSITIONS
 
APPARENT SUPERLUMINAL MOTION      (ApparentSuperluminalMotion)
superluminal motion MOTION VELOCITY OF LIGHT
 
APSIDAL MOTIONS      (ApsidalMotions)
MOTION APSIDES ,
ORBITS
 
APSIDES      (Apsides)
apse ,
apsis 		ORBITAL ELEMENTS APASTRON ,
APHELION ,
APOGEE ,
PERIASTRON ,
PERIGEE ,
PERIHELION 		APSIDAL MOTIONS ,
ORBITS
 
Ap STARS      (ApStars)
peculiar a stars A STARS ,
PECULIAR STARS 		HOLMIUM STARS ,
MANGANESE STARS ,
SILICON STARS ,
SPECTRUM VARIABLE STARS 		ALPHA2 CANUM VENATICORUM STARS ,
MAGNETIC STARS ,
MAGNETIC VARIABLE STARS ,
OBLIQUE ROTATORS ,
RAPID OSCILLATIONS
 
ARCHAEOASTRONOMY      (Archaeoastronomy)
ancient astronomy ,
astroarchaeology 		ASTRONOMY ,
HISTORY OF ASTRONOMY 		MEGALITHIC ASTRONOMY ARMILLARY SPHERES ,
ASTROLABES ,
ASTROLOGY
 
ARMILLARY SPHERES      (ArmillarySpheres)
ARCHAEOASTRONOMY
 
ARRAY PROCESSORS      (ArrayProcessors)
DETECTOR ARRAYS
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ARRAYS      (Arrays)
DETECTOR ARRAYS ,
DIODE ARRAYS ,
PHASED ARRAYS ,
T ARRAYS ,
TELESCOPE ARRAYS ,
VERY LARGE ARRAYS ,
Y ARRAYS 		ANTENNAS ,
GRATING RESPONSE ,
INTERFEROMETERS ,
RADIO INTERFEROMETERS ,
RADIO TELESCOPES
 
ARTIFICIAL SATELLITES      (ArtificialSatellites)
satellites GEOSTATIONARY SATELLITES GAMMA RAY OBSERVATORIES ,
ORBITING OBSERVATORIES ,
POLAR ORBITS ,
SATELLITE LASER RANGING ,
SPACE ASTRONOMY ,
SPACE TELESCOPES ,
SPACE VEHICLES ,
X RAY OBSERVATORIES
Named satellite observatories not included.
 
ASHEN LIGHT      (AshenLight)
ATMOSPHERIC RADIATION AIRGLOW
Refers to Venus' atmosphere
 
A STARS      (AStars)
EARLY TYPE STARS A DWARF STARS ,
A GIANT STARS ,
A SUBDWARF STARS ,
A SUBGIANT STARS ,
A SUPERGIANT STARS ,
Ae STARS ,
Am STARS ,
Ap STARS 		EARLY TYPE VARIABLE STARS ,
SPECTRAL TYPES
 
ASTEROID BELT      (AsteroidBelt)
MINOR PLANETS
 
ASTEROIDS      (Asteroids)
See under MINOR PLANETS
 
ASTEROSEISMOLOGY      (Asteroseismology)
stellar seismology SEISMOLOGY HELIOSEISMOLOGY PULSATING VARIABLE STARS ,
PULSATIONS ,
RAPID OSCILLATIONS ,
SOLAR OSCILLATIONS ,
STELLAR OSCILLATIONS
 
ASTIGMATISM      (Astigmatism)
ABERRATIONS CHROMATIC ABERRATION ,
COMA ,
DISTORTION ,
FIELD CURVATURE ,
SPHERICAL ABERRATION
 
ASTRODYNAMICS      (Astrodynamics)
CELESTIAL MECHANICS
 
ASTROGRAPHIC CAMERAS      (AstrographicCameras)
CAMERAS
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ASTROGRAPHIC CATALOGS      (AstrographicCatalogs)
CATALOGS
 
ASTROGRAPHS      (Astrographs)
ASTROMETRIC INSTRUMENTS
 
ASTROLABES      (Astrolabes)
ASTROMETRIC INSTRUMENTS ,
INSTRUMENTATION 		DANJON ASTROLABES ,
IMPERSONAL ASTROLABES 		ARCHAEOASTRONOMY
 
ASTROLOGY      (Astrology)
ARCHAEOASTRONOMY ,
ASTRONOMY ,
CONSTELLATIONS ,
PLANETS ,
ZODIAC
 
ASTROMETRIC BINARY STARS      (AstrometricBinaryStars)
BINARY STARS
 
ASTROMETRIC INSTRUMENTS      (AstrometricInstruments)
INSTRUMENTATION ASTROGRAPHS ,
ASTROLABES ,
QUADRANTS ,
SEXTANTS ,
TRANSIT INSTRUMENTS 		ASTROMETRY ,
TIME
 
ASTROMETRY      (Astrometry)
positional astronomy ASTRONOMICAL TECHNIQUES ,
ASTRONOMY ,
OBSERVING TECHNIQUES 		PHOTOGRAPHIC ASTROMETRY ,
RADIO ASTROMETRY ,
SPACE ASTROMETRY 		ABERRATION ,
APPARENT POSITIONS ,
ASTROMETRIC INSTRUMENTS ,
ASTRONOMICAL GEODESY ,
CELESTIAL MECHANICS ,
COORDINATE SYSTEMS ,
EARTH ROTATION ,
EQUATOR POSITION ,
FUNDAMENTAL STARS ,
LATITUDE DETERMINATION ,
MERIDIAN CIRCLES ,
OPTICAL POSITIONS ,
PARALLAXES ,
PRECESSION ,
REFERENCE SYSTEMS ,
STELLAR MOTIONS ,
TRANSIT INSTRUMENTS ,
TRANSITS ,
TRUE POSITIONS
 
ASTRONOMERS      (Astronomers)
AMATEUR ASTRONOMY ,
ASTRONOMICAL RESEARCH
 
ASTRONOMICAL CONSTANTS      (AstronomicalConstants)
CONSTANTS ,
FUNDAMENTAL CONSTANTS 		ASTRONOMICAL UNIT ,
GRAVITATIONAL CONSTANT 		CELESTIAL MECHANICS
 
ASTRONOMICAL GEODESY      (AstronomicalGeodesy)
GEODESY ASTROMETRY
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ASTRONOMICAL OPTICS      (AstronomicalOptics)
OPTICS
 
ASTRONOMICAL RESEARCH      (AstronomicalResearch)
SPACE RESEARCH AMATEUR ASTRONOMY ,
ASTRONOMERS
 
ASTRONOMICAL TECHNIQUES      (AstronomicalTechniques)
ASTROMETRY ,
INTERFEROMETRY ,
PHOTOMETRY ,
POLARIMETRY ,
SPECTROMETRY ,
SPECTROPHOTOMETRY ,
SPECTROSCOPY 		ANALYSES ,
OBSERVING TECHNIQUES ,
PHOTOGRAPHY ,
REDUCTION METHODS
Most used in several wavelength regions.
 
ASTRONOMICAL UNIT      (AstronomicalUnit)
ASTRONOMICAL CONSTANTS ANNUAL PARALLAX ,
DISTANCE SCALE ,
HELIOCENTRIC CORRECTION ,
PARALLAXES ,
PARSEC ,
SOLAR PARALLAX ,
TRIGONOMETRIC PARALLAX
 
ASTRONOMY      (Astronomy)
ARCHAEOASTRONOMY ,
ASTROMETRY ,
ASTROPHYSICS ,
COSMOGONY ,
COSMOLOGY ,
GROUND BASED ASTRONOMY 		ASTROLOGY
Combine with other terms
 
ASTROPHYSICS      (Astrophysics)
theoretical astrophysics ASTRONOMY COSMOLOGY
Combine with other terms
 
A SUBDWARF STARS      (ASubdwarfStars)
A STARS ,
SUBDWARF STARS 		A DWARF STARS
 
A SUBGIANT STARS      (ASubgiantStars)
A STARS ,
SUBGIANT STARS
 
A SUPERGIANT STARS      (ASupergiantStars)
A STARS ,
EARLY TYPE SUPERGIANT STARS ,
SUPERGIANT STARS
 
ASYMPTOTIC GIANT BRANCH      (AsymptoticGiantBranch)
agb HERTZSPRUNG RUSSELL DIAGRAM ,
LATE TYPE GIANT STARS
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ATAXITES      (Ataxites)
METEORITES
 
ATLASES      (Atlases)
charts STAR ATLASES CATALOGS ,
FINDING CHARTS ,
MAPS ,
SKY SURVEYS ,
SURVEYS
 
ATMOSPHERES      (Atmospheres)
EARTH ATMOSPHERE ,
STELLAR ATMOSPHERES 		AERONOMY ,
AIR ,
ANGLE OF REFRACTION ,
BOUNDARY LAYERS ,
GREENHOUSE EFFECT ,
LIMB BRIGHTENING ,
LIMB DARKENING ,
MACROTURBULENCE ,
MICROTURBULENCE ,
OPACITY ,
PLANETS ,
RADIATION BELTS ,
SCALE HEIGHT ,
SCINTILLATION ,
TEMPERATURE ZONES ,
WATER VAPOR
Combine with other terms
 
ATMOSPHERIC DENSITY      (AtmosphericDensity)
DENSITY SCALE HEIGHT
 
ATMOSPHERIC EXTINCTION      (AtmosphericExtinction)
extinction ABSORPTION ,
SCATTERING 		ABSORPTION COEFFICIENT ,
ATMOSPHERIC WINDOWS ,
EARTH ATMOSPHERE ,
LIGHT ABSORPTION ,
LIGHT SCATTERING ,
ULTRAVIOLET EXTINCTION
Refers to earth atmosphere.
 
ATMOSPHERIC RADIATION      (AtmosphericRadiation)
sky radiation TERRESTRIAL RADIATION AFTERGLOW ,
AIRGLOW ,
ASHEN LIGHT ,
AURORAS 		SKY BRIGHTNESS
 
ATMOSPHERIC REFRACTION      (AtmosphericRefraction)
ACTIVE OPTICS ,
ADAPTIVE OPTICS ,
ATMOSPHERIC SCINTILLATION ,
POINT SPREAD FUNCTION ,
REFRACTIVE INDEX ,
SCINTILLATION ,
SEEING ,
SPECKLES
 
ATMOSPHERIC SCATTERING      (AtmosphericScattering)
ABSORPTION ,
EARTH ATMOSPHERE
 
ATMOSPHERIC SCINTILLATION      (AtmosphericScintillation)
twinkling SCINTILLATION ATMOSPHERIC REFRACTION ,
EARTH ATMOSPHERE ,
SEEING
 
ATMOSPHERIC TIDES      (AtmosphericTides)
TIDES
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
ATMOSPHERIC WINDOWS      (AtmosphericWindows)
WINDOWS INFRARED WINDOWS ,
OPTICAL WINDOWS ,
RADIO WINDOWS 		ABSORPTION ,
ATMOSPHERIC EXTINCTION ,
EARTH ATMOSPHERE ,
TRANSPARENCY
Spectral ranges transmitted by the earth's atmosphere.
 
ATOMIC CLOCKS      (AtomicClocks)
cesium clocks CLOCKS ,
MEASURING INSTRUMENTS 		ATOMIC TIME ,
GEODESY ,
TIME ,
TIME STANDARDS ,
TIME SYNCHRONIZATION ,
VERY LONG BASELINE INTERFEROMETRY
 
ATOMIC LINES      (AtomicLines)
ATOMIC SPECTRA
 
ATOMIC PHYSICS      (AtomicPhysics)
Combine with other terms
 
ATOMIC PROCESSES      (AtomicProcesses)
ABSORPTION LINES ,
EMISSION LINES ,
EXCITATION ,
POPULATION INVERSION
 
ATOMIC SPECTRA      (AtomicSpectra)
ABSORPTION SPECTRA ,
SPECTRA 		ATOMIC LINES
 
ATOMIC TIME      (AtomicTime)
ATOMIC CLOCKS
 
ATOMS      (Atoms)
CHEMICAL ELEMENTS
 
ATTENUATION      (Attenuation)
FILTERS
 
AURORAL ARCS      (AuroralArcs)
AURORAS
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
AURORAL JETS      (AuroralJets)
AURORAS
 
AURORAS      (Auroras)
ATMOSPHERIC RADIATION AURORAL ARCS ,
AURORAL JETS 		AIRGLOW ,
LIGHT EMISSION ,
MAGNETIC DISTURBANCES ,
MAGNETIC POLES ,
MAGNETIC STORMS ,
NIGHT SKY BRIGHTNESS ,
PHOTOIONIZATION ,
RAYLEIGH ,
SKY BRIGHTNESS ,
SOLAR ACTIVITY ,
UPPER ATMOSPHERE
 
AUSTRALITES      (Australites)
METEORITES ,
TEKTITES 		BEDIASITES ,
CHONDRITES ,
MOLDAVITES
 
AUTOGUIDERS      (Autoguiders)
CONTROL SYSTEMS ,
GUIDE SYSTEMS 		AUTOMATIC PATROL TELESCOPES ,
QUADRANT DETECTORS ,
TRACKING
 
AUTOMATED TELESCOPES      (AutomatedTelescopes)
robotic telescopes TELESCOPES AUTOMATIC PATROL TELESCOPES REMOTE CONTROL SYSTEMS
 
AUTOMATIC PATROL TELESCOPES      (AutomaticPatrolTelescopes)
AUTOMATED TELESCOPES ,
OPTICAL TELESCOPES 		AUTOGUIDERS ,
PHOTOMETRY ,
REMOTE CONTROL SYSTEMS
 
AUTUMNAL EQUINOX      (AutumnalEquinox)
EQUINOXES VERNAL EQUINOX
 
AUXILIARY INSTRUMENTS      (AuxiliaryInstruments)
INSTRUMENTATION
 
AVALANCHE PHOTODIODES      (AvalanchePhotodiodes)
PHOTODIODES ,
PHOTOELECTRONIC DEVICES 		PHOTOMETRY
 
AXES      (Axes)
Combine with other terms
 
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Descriptionaltbroadernarrowerrelated
AXIONS      (Axions)
ELEMENTARY PARTICLES
 
AZIMUTH      (Azimuth)
bearing ALTAZIMUTH MOUNTING ,
ALTITUDE [ANGLE] ,
HORIZON ,
HORIZON COORDINATE SYSTEM
 
Thu Jul 3 15:11:37 2008