| 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 | ||||
| Description | alt | broader | narrower | related |
|---|---|---|---|---|
| 21-cm line (21CmLine) | ||||
|
21 centimeter line of hydrogen |
21 cm line | radio recombination line |
H I
, H I absorption , H I cloud , H I content , H I emission , H I region , hydrogen , radio frequency |
|
| 53 Persei star (53PerseiStar) | ||||
|
53 Persei star |
B star
, pulsating variable star |
|||
| Abell cluster (AbellCluster) | ||||
|
Abell cluster |
galaxy cluster | |||
| aberration (aberration) | ||||
|
aberration of light |
astrometry
, coordinate system |
|||
| ablation (ablation) | ||||
|
ablation |
meteorite | |||
| abnormal spectrum (abnormalSpectrum) | ||||
|
abnormal spectrum |
spectrum | peculiar star | ||
| absolute magnitude (absoluteMagnitude) | ||||
|
absolute magnitude |
magnitude |
Hertzsprung-Russell diagram
, Wilson-Bappu effect , distance , distance modulus , luminosity |
||
| absolute temperature scale (absoluteTemperatureScale) | ||||
|
absolute temperature scale |
temperature scale | Kelvin |
celsius temperature scale
, temperature |
|
| ES: moved Kelvin from RT to NT (2007-OCT-8) | ||||
| absorption (absorption) | ||||
|
absorption |
atmospheric extinction
, intergalactic absorption , interstellar absorption , light absorption |
Rosseland opacity
, atmospheric scattering , atmospheric window , capture , equivalent width , interstellar gas , opacity , photodissociation , photoionization , radiation , radiative equilibrium , reddened star , reddening , transmission |
||
| combine with other terms | ||||
| absorption coefficient (absorptionCoefficient) | ||||
|
absorption coefficient |
absorptivity |
Einstein coefficient
, atmospheric extinction , intergalactic absorption , interstellar absorption , optical depth , transparency |
||
| 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 | ||||
| Description | alt | broader | narrower | related |
| absorption line (absorptionLine) | ||||
|
absorption line |
spectral line | absorption line system |
Lyman alpha forest
, Voigt profile , atomic process , bound-free transition , calcium line , cyanogen line , line formation , line identification , line profile , line ratio , metal line , microturbulence , residual intensity , spectrum , spectroscopic analysis |
|
| absorption line system (absorptionLineSystem) | ||||
|
absorption line system |
absorption line
, system |
quasar | ||
| ES: new (2007-OCT-8) | ||||
| absorption spectroscopy (absorptionSpectroscopy) | ||||
|
absorption spectroscopy |
spectroscopy | |||
| absorption spectrum (absorptionSpectrum) | ||||
|
absorption spectrum |
line spectrum
, spectrum |
atomic spectrum |
Balmer series
, D line , Fraunhofer line , Raman effect , bound-free transition , energy spectrum |
|
| abundance (abundance) | ||||
|
abundance |
chemical abundance
, element abundance , stellar abundance |
cosmic abundance
, isotopic abundance , metal abundance , overabundance , underabundance |
CNO anomaly
, abundance ratio , chemical composition , chemical element , chemical evolution , curve of growth , element formation , enrichment , heavy element , helium-poor star , helium-rich star , peculiar star , rare earth |
|
| may be combined with element, e.g. helium abundance | ||||
| abundance ratio (abundanceRatio) | ||||
|
abundance ratio |
CNO anomaly
, abundance |
|||
| acceleration (acceleration) | ||||
|
acceleration |
kinematics |
deceleration
, gravimetry , orbital element , orbit |
||
| accretion (accretion) | ||||
|
accretion |
Alfven surface
, accretion disk , binary star , mass-transfer , particle accretion |
|||
| accretion disk (accretionDisk) | ||||
|
accretion discs UK accretion disk |
disk |
accretion
, black hole , circumstellar disk , close binary star , cooling flow , dwarf nova , low-mass X-ray binary star , stellar wind , superhump |
||
| achondrite (achondrite) | ||||
|
achondrite |
chondrite
, meteorite |
|||
| 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 | ||||
| Description | alt | broader | narrower | related |
| acoustics (acoustics) | ||||
|
acoustics |
acoustic wave | |||
| acoustic wave (acousticWave) | ||||
|
acoustic wave |
sound
, sound wave |
wave |
acoustics
, gravity wave , sound speed , wavelength |
|
| actinium (actinium) | ||||
|
actinium (atomic number 89) |
Ac | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| active galactic nucleus (activeGalacticNucleus) | ||||
|
active galactic nucleus |
AGN |
X-ray source
, galactic nucleus , variable source |
Seyfert nucleus
, blazar |
BL Lacertae object
, active galaxy , compact nucleus , emission line galaxy , galaxy , quasar , radio galaxy |
| active galaxy (activeGalaxy) | ||||
|
active galaxy |
eruptive galaxy |
X-ray source
, galaxy |
X-ray flare
, active galactic nucleus , compact galaxy , emission line galaxy |
|
| active optics (activeOptics) | ||||
|
active optics |
optics |
adaptive optics
, atmospheric refraction , multiple mirror telescope , seeing , tip-tilt mirror |
||
| active prominence (activeProminence) | ||||
|
active prominence |
active region
, prominence |
Sun | ||
| active region (activeRegion) | ||||
|
solar active region |
active prominence | Sun | ||
| FVH: new (2007-OCT-29) | ||||
| active star (activeStar) | ||||
|
active star |
star |
X-ray star
, emission line star |
X-ray flare | |
| active Sun (activeSun) | ||||
|
active Sun |
Sun |
flare
, quiet Sun , solar activity , solar cycle , sunspot |
||
| 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 | ||||
| Description | alt | broader | narrower | related |
| activity index (activityIndex) | ||||
|
activity index |
solar activity | |||
| adaption (adaption) | ||||
|
adaption |
||||
| combine with other terms | ||||
| adaptive optics (adaptiveOptics) | ||||
|
adaptive optics |
optics |
active optics
, atmospheric refraction , seeing , segmented optics |
||
| adiabatic process (adiabaticProcess) | ||||
|
adiabatic process |
energy-transfer
, thermodynamics |
|||
| adjustment (adjustment) | ||||
|
adjustment |
alignment optics
, collimation , correction , optics , orientation |
|||
| combine with other terms | ||||
| adsorption (adsorption) | ||||
|
adsorption |
dust grain
, interplanetary grain , interstellar dust |
|||
| combine with other terms | ||||
| A dwarf (ADwarf) | ||||
|
A dwarf star |
A star
, dwarf |
A subdwarf | ||
| aerolite (aerolite) | ||||
|
aerolite |
meteorite | |||
| aeronomy (aeronomy) | ||||
|
aeronomy |
scientific field |
Earth atmosphere
, atmosphere , planet |
||
| Ae star (AeStar) | ||||
|
Ae star |
A star
, Herbig AeBe star , early-type emission star |
Herbig AeBe star | Be star | |
| 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 | ||||
| Description | alt | broader | narrower | related |
| afterglow (afterglow) | ||||
|
afterglow |
atmospheric radiation |
light scattering
, luminescence |
||
| age (age) | ||||
|
age |
Hubble time
, cosmochronology , relaxation time , turnoff point |
|||
| combine with other terms | ||||
| A giant (AGiant) | ||||
|
A giant star |
A star
, giant |
|||
| air (air) | ||||
|
air |
gas | atmosphere | ||
| air conditioning (airConditioning) | ||||
|
air conditioning |
temperature control
, ventilation |
|||
| airglow (airglow) | ||||
|
airglow |
dayglow
, nightglow |
atmospheric radiation |
Rayleigh scattering
, ashen light , aurora , night sky brightness , radiative recombination , sky brightness |
|
| airplane-borne instrument (airplaneBorneInstrument) | ||||
|
airplane-borne instrument |
airplane borne instrument | instrument |
balloon-borne instrument
, ground-based astronomy , infrared observatory , rocket-borne instrument , satellite-borne instrument |
|
| air pollution (airPollution) | ||||
|
air pollution |
pollution |
light pollution
, site protection |
||
| Airy disk (AiryDisk) | ||||
|
Airy discs UK Airy disk |
diffraction | |||
| albedo (albedo) | ||||
|
albedo |
spherical albedo | optical property |
illumination
, radiation , reflection , surface property |
|
| 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 | ||||
| Description | alt | broader | narrower | related |
| Alfven surface (AlfvenSurface) | ||||
|
Alfven surface |
accretion
, neutron star |
|||
| Alfven wave (AlfvenWave) | ||||
|
Alfven wave |
hydromagnetic wave | magnetohydrodynamics | coronal wave | |
| Algol variable star (AlgolVariableStar) | ||||
|
Algol variable star |
beta Persei star |
binary star
, eclipsing binary star |
W Ursae Majoris star | |
| alignment optics (alignmentOptics) | ||||
|
alignment of optical image |
adjustment
, collimation , correction , orientation |
|||
| all-sky camera (allSkyCamera) | ||||
|
all-sky camera |
all sky camera |
camera
, wide-field telescope |
cloud monitor |
all-sky photography
, wide-angle lens |
| FVH: added NT CLOUD_MONITORS (2007-SEP-21) | ||||
| all-sky photography (allSkyPhotography) | ||||
|
all-sky photography |
all sky photography | photography |
all-sky camera
, camera , wide-angle lens |
|
| almanac (almanac) | ||||
|
almanac |
nautical almanac | ephemeris | ||
| alpha2 Canum Venaticorum star (alpha2CanumVenaticorumStar) | ||||
|
alpha2 Canum Venaticorum star |
eruptive binary star
, magnetic variable star |
Ap star
, SX Arietis star , spectrum variable star |
||
| FVH: removed incorrect BT cataclysmic_variable_star (2007-OCT-2) | ||||
| alpha particle (alphaParticle) | ||||
|
alpha particle |
boson
, composite particle , nuclear radiation , particle |
electron
, neutron , proton , radioactivity |
||
| altazimuth mounting (altazimuthMounting) | ||||
|
altazimuth mounting |
alt-azimuth mounting
, azimuth mounting |
telescope mounting |
altitude angle
, azimuth , equatorial mounting , horizon coordinate system , siderostat , vertical circle |
|
| 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 | ||||
| Description | alt | broader | narrower | related |
| altimeter (altimeter) | ||||
|
altimeter |
measuring instrument | weather station | ||
| altimetry (altimetry) | ||||
|
altimetry |
||||
| altitude angle (altitudeAngle) | ||||
|
altitude [angle] |
elevation angle |
altazimuth mounting
, azimuth , horizon , horizon coordinate system , sextant , zenith distance |
||
| use for angle; see ALTITUDE_HEIGHT for height | ||||
| aluminizing (aluminizing) | ||||
|
aluminizing |
aluminum coating
, mirror , vacuum technique |
|||
| aluminum (aluminum) | ||||
|
aluminum (atomic number 13) |
Al | fundamental chemical element | aluminum coating | |
| FVH: new (2007-OCT-25) | ||||
| aluminum coating (aluminumCoating) | ||||
|
aluminium coating UK aluminum coating |
aluminum
, coating , thin film |
aluminizing
, mirror , optical surface , silver coating , vacuum technique , vapor deposition |
||
| FVH: moved aluminium_coating to localized D (2007-SEP-24) | ||||
| amateur astronomy (amateurAstronomy) | ||||
|
amateur astronomy |
astronomy |
astronomer
, astronomical research |
||
| AM Canum Venaticorum star (AmCanumVenaticorumStar) | ||||
|
AM Canum Venaticorum star |
hydrogen deficient star
, nova-like variable |
UX Ursae Majoris star
, dwarf nova |
||
| americium (americium) | ||||
|
americium (atomic number 95) |
Am | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| AM Herculis star (AmHerculisStar) | ||||
|
AM Herculis star |
polars | cataclysmic variable star | ||
| 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 | ||||
| Description | alt | broader | narrower | related |
| ammonia (ammonia) | ||||
|
ammonia |
interstellar molecule | |||
| Amor group (AmorGroup) | ||||
|
Amor group |
minor planet family |
Apollo group
, Trojan group |
||
| amplifier (amplifier) | ||||
|
amplifier |
instrument |
microchannel plate
, parametric amplifier , preamplifier |
image tube
, photomultiplier tube , pulse counter , pulse counting |
|
| amplitude (amplitude) | ||||
|
amplitude |
decay oscillation
, magnitude , oscillation , pulsation , variable star , vibration |
|||
| Am star (AmStar) | ||||
|
Am star |
A star
, magnetic star , magnetic variable star , metal-rich star |
spectrum variable star | ||
| analog recorder (analogRecorder) | ||||
|
analog recorder |
data storage | |||
| analysis (analysis) | ||||
|
analysis |
data analysis
, fine analysis , signal analysis , signal processing |
astronomical technique
, quantization , reduction method |
||
| combine with other terms | ||||
| anemometer (anemometer) | ||||
|
anemometer |
measuring instrument |
weather station
, wind vane |
||
| FVH: new (2007-SEP-21) | ||||
| angular diameter (angularDiameter) | ||||
|
angular diameter |
apparent diameter | diameter | isophotal diameter |
interferometry
, occultation , speckle interferometry |
| angular momentum (angularMomentum) | ||||
|
angular momentum |
kinematics
, momentum , rotation |
|||
| 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 | ||||
| Description | alt | broader | narrower | related |
| angular resolution (angularResolution) | ||||
|
angular resolution |
resolution |
angular separation
, beamwidth , optics , speckle interferometry |
||
| angular separation (angularSeparation) | ||||
|
angular separation |
angular distance |
angular resolution
, optical double star , speckle interferometry |
||
| angular velocity (angularVelocity) | ||||
|
angular velocity |
velocity |
celestial mechanics
, orbital velocity , rotation |
||
| anisotropy (anisotropy) | ||||
|
anisotropy |
background radiation
, isotropy , polarization charge separation |
|||
| annual equation (annualEquation) | ||||
|
annual equation |
Earth-Moon system
, Earth orbit , elliptical orbit |
|||
| annual parallax (annualParallax) | ||||
|
annual parallax |
heliocentric parallax
, parallax |
parallax | Astronomical Unit | |
| annular eclipse (annularEclipse) | ||||
|
annular eclipse |
eclipse | total eclipse | ||
| anomalistic month (anomalisticMonth) | ||||
|
anomalistic month |
Moon
, orbital anomaly |
|||
| anomalistic year (anomalisticYear) | ||||
|
anomalistic year |
year | orbital anomaly | ||
| anomaly (anomaly) | ||||
|
anomaly |
CNO anomaly
, gravity anomaly , magnetic anomaly |
|||
| FVH: generic non-orbital anomaly; old entry moved to orbital_anomaly (2007-OCT-29) | ||||
| 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 | ||||
| Description | alt | broader | narrower | related |
| ansa (ansa) | ||||
|
ansa |
lenticular galaxy
, planetary nebula , ring |
|||
| antapex (antapex) | ||||
|
antapex |
apex
, solar motion |
|||
| antarctic observatory (antarcticObservatory) | ||||
|
antarctic observatory |
observatory | |||
| antenna (antenna) | ||||
|
antenna |
aerials
, antennas |
radar equipment |
Cassegrain antenna
, Mills cross antenna , Yagi antenna , dipole antenna , directional antenna , horn antenna , lens antenna , microwave antenna , parabolic antenna , radio antenna , reflector antenna |
array
, current sheet , current , dish antenna , feed horn , interferometer , radar , radio telescope , telescope |
| antenna design (antennaDesign) | ||||
|
antenna design |
polar diagram
, radio telescope |
|||
| anthropic principle (anthropicPrinciple) | ||||
|
anthropic principle |
cosmology
, life |
|||
| antimatter (antimatter) | ||||
|
antimatter |
matter | antiparticle | ||
| antimony (antimony) | ||||
|
antimony (atomic number 51) |
Sb | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| antineutrino (antineutrino) | ||||
|
antineutrino |
antiparticle | neutrino | ||
| antinode (antinode) | ||||
|
antinode |
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 | ||||
| Description | alt | broader | narrower | related |
| antinucleon (antinucleon) | ||||
|
antinucleon |
antiparticle | |||
| antiparticle (antiparticle) | ||||
|
antiparticle |
antimatter
, elementary particle |
antineutrino
, antinucleon , antiproton , positron |
||
| antiproton (antiproton) | ||||
|
antiproton |
antiparticle | proton | ||
| antireflection coating (antireflectionCoating) | ||||
|
antireflection coating |
coating
, optical film , thin film |
lens
, optical surface |
||
| apastron (apastron) | ||||
|
apastron |
apsis | periastron | ||
| aperiodic comet (aperiodicComet) | ||||
|
aperiodic comet |
comet | |||
| aperture (aperture) | ||||
|
aperture |
aperture synthesis
, apodization , optical system |
|||
| aperture synthesis (apertureSynthesis) | ||||
|
aperture synthesis |
synthetic aperture |
aperture
, grading function , grating ring , interferometry , visibility function |
||
| apex (apex) | ||||
|
apex |
antapex
, solar motion |
|||
| aphelion (aphelion) | ||||
|
aphelion |
apsis |
Earth orbit
, perihelion , planet |
||
| 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 | ||||
| Description | alt | broader | narrower | related |
| apocenter (apocenter) | ||||
|
apocenter |
binary star | |||
| apodization (apodization) | ||||
|
apodization |
apodisation UK |
aperture
, radio telescope |
||
| apogee (apogee) | ||||
|
apogee |
apsis |
Moon
, perigee |
||
| Apollo group (ApolloGroup) | ||||
|
Apollo group |
minor planet family |
Amor group
, Hirayama family , Trojan group |
||
| apparent intensity (apparentIntensity) | ||||
|
apparent intensity |
intensity | |||
| apparent magnitude (apparentMagnitude) | ||||
|
apparent magnitude |
magnitude |
B magnitude
, H magnitude , I magnitude , J magnitude , K magnitude , L magnitude , M magnitude , N magnitude , O magnitude , P magnitude , Q magnitude , R magnitude , U magnitude , V magnitude , photoelectric magnitude , photographic magnitude , photovisual magnitude |
photometric system
, photometry |
|
| apparent position (apparentPosition) | ||||
|
apparent position |
apparent places | position |
astrometry
, true position |
|
| apparent superluminal motion (apparentSuperluminalMotion) | ||||
|
apparent superluminal motion |
superluminal motion | motion | velocity of light | |
| apsidal motion (apsidalMotion) | ||||
|
apsidal motion |
motion |
apsis
, orbit |
||
| apsis (apsis) | ||||
|
apsis |
apse | orbital element |
apastron
, aphelion , apogee , periastron , perigee , perihelion |
apsidal motion
, orbit |
| apse = apsis, apsides is plural | ||||
| 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 | ||||
| Description | alt | broader | narrower | related |
| Ap star (ApStar) | ||||
|
Ap star |
peculiar A star |
A star
, peculiar star |
holmium star
, manganese star , silicon star , spectrum variable star |
alpha2 Canum Venaticorum star
, magnetic star , magnetic variable star , oblique rotator , rapid oscillation |
| arc (arc) | ||||
|
arc |
auroral arc
, luminous arc |
|||
| FVH: made general term (2007-OCT-1) | ||||
| archaeoastronomy (archaeoastronomy) | ||||
|
archaeoastronomy |
ancient astronomy
, astroarchaeology |
astronomy
, history of astronomy |
megalithic astronomy |
armillary sphere
, astrolabe , astrology |
| argon (argon) | ||||
|
argon (atomic number 18) |
Ar | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| armillary sphere (armillarySphere) | ||||
|
armillary sphere |
instrument | archaeoastronomy | ||
| array (array) | ||||
|
array |
detector array
, diode array , phased array , t array , telescope array , very long baseline interferometer , y array |
antenna
, grating response , interferometer , radio interferometer , radio telescope |
||
| array processor (arrayProcessor) | ||||
|
array processor |
computer | detector array | ||
| arsenic (arsenic) | ||||
|
arsenic (atomic number 33) |
As | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| artificial satellite (artificialSatellite) | ||||
|
artificial satellite |
geostationary satellite
, space observatory |
polar orbit
, satellite laser ranging , space astronomy , space telescope , space vehicle |
||
| ascending node (ascendingNode) | ||||
|
ascending node |
node | |||
| FVH: moved NODES to BT (2007-OCT-1) | ||||
| 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 | ||||
| Description | alt | broader | narrower | related |
| ashen light (ashenLight) | ||||
|
ashen light |
atmospheric radiation |
Venus
, airglow |
||
| refers to Venus' atmosphere | ||||
| A star (AStar) | ||||
|
A star |
early-type star |
A dwarf
, A giant , A subdwarf , A subgiant , A supergiant , Ae star , Am star , Ap star |
early-type variable star
, spectral type |
|
| astatine (astatine) | ||||
|
astatine (atomic number 85) |
At | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| asteroid (asteroid) | ||||
|
asteroid |
minor planet
, planetoid |
rotating body | near-Earth asteroid |
Edgeworth-Kuiper belt
, Kirkwood gap , Solar System , asteroid belt , asteroid occultation , interplanetary matter , meteor stream , meteorite , meteoroid dust cloud , meteoroid , minor planet family , planetesimal , resonance gap , trans-Neptunian object |
| asteroid belt (asteroidBelt) | ||||
|
asteroid belt |
asteroid | |||
| asteroid occultation (asteroidOccultation) | ||||
|
occultation by asteroid |
occultation | asteroid | ||
| FVH: new (2007-OCT-8) | ||||
| asteroseismology (asteroseismology) | ||||
|
asteroseismology |
stellar seismology | seismology | helioseismology |
pulsating variable star
, pulsation , rapid oscillation , solar oscillation , stellar oscillation |
| astigmatism (astigmatism) | ||||
|
astigmatism |
optical aberration |
chromatic aberration
, comatic aberration , distortion , field curvature , spherical aberration |
||
| astrobiology (astrobiology) | ||||
|
astrobiology |
exobiology |
astronomy
, biology , scientific field |
cosmochemistry
, extraterrestrial life |
|
| astrodynamics (astrodynamics) | ||||
|
astrodynamics |
celestial mechanics | |||
| 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 | ||||
| Description | alt | broader | narrower | related |
| astrograph (astrograph) | ||||
|
astrograph |
astrometric instrument | |||
| astrographic camera (astrographicCamera) | ||||
|
astrographic camera |
camera | |||
| astrographic catalog (astrographicCatalog) | ||||
|
astrographic catalog |
astrographic catalogues UK | catalog | ||
| astrolabe (astrolabe) | ||||
|
astrolabe |
astrometric instrument
, instrument |
Danjon astrolabe
, impersonal astrolabe |
archaeoastronomy | |
| astrology (astrology) | ||||
|
astrology |
scientific field |
archaeoastronomy
, astronomy , constellation , planet , zodiac |
||
| astrometric binary star (astrometricBinaryStar) | ||||
|
astrometric binary star |
binary star | |||
| astrometric instrument (astrometricInstrument) | ||||
|
astrometric instrument |
instrument |
astrograph
, astrolabe , quadrant , sextant , transit instrument |
astrometry
, time |
|
| astrometry (astrometry) | ||||
|
astrometry |
positional astronomy |
astronomical technique
, astronomy , observing technique |
photographic astrometry
, radio astrometry , space astrometry |
Earth rotation
, aberration , apparent position , astrometric instrument , astronomical geodesy , celestial mechanics , coordinate system , equator position , fundamental star , latitude determination , meridian circle , optical position , parallax , precession , reference system , stellar motion , transit instrument , transit , true position |
| astronomer (astronomer) | ||||
|
astronomer |
amateur astronomy
, astronomical research |
|||
| astronomical constant (astronomicalConstant) | ||||
|
astronomical constant |
constant |
Astronomical Unit
, Oort constant |
celestial mechanics
, physical constant |
|
| 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 | ||||
| Description | alt | broader | narrower | related |
| astronomical geodesy (astronomicalGeodesy) | ||||
|
astronomical geodesy |
geodesy | astrometry | ||
| astronomical optics (astronomicalOptics) | ||||
|
astronomical optics |
optics | |||
| astronomical research (astronomicalResearch) | ||||
|
astronomical research |
space research |
amateur astronomy
, astronomer |
||
| astronomical technique (astronomicalTechnique) | ||||
|
astronomical technique |
astrometry
, interferometry , photometry , polarimetry , spectrophotometry , spectroscopy |
analysis
, observing technique , photography , reduction method |
||
| most used in several wavelength region | ||||
| Astronomical Unit (AstronomicalUnit) | ||||
|
Astronomical Unit |
A.U.
, AU |
astronomical constant |
annual parallax
, distance scale , heliocentric correction , parallax , parsec , solar parallax , trigonometric parallax |
|
| FVH: added ALT A.U. (2007-09-21) | ||||
| astronomy (astronomy) | ||||
|
astronomy |
scientific field |
amateur astronomy
, archaeoastronomy , astrobiology , astrometry , cosmic ray astronomy , cosmogony , cosmology , ground-based astronomy , infrared astronomy , space astronomy |
astrology | |
| astrophysics (astrophysics) | ||||
|
astrophysics |
scientific field |
high-energy astrophysics
, theoretical astrophysics |
cosmology | |
| FVH: moved theoretical_astrophysics to NT (2007-OCT-1) | ||||
| combine with other terms | ||||
| A subdwarf (ASubdwarf) | ||||
|
A subdwarf star |
A star
, subdwarf |
A dwarf | ||
| A subgiant (ASubgiant) | ||||
|
A subgiant star |
A star
, subgiant |
|||
| A supergiant (ASupergiant) | ||||
|
A supergiant star |
A star
, early-type supergiant , supergiant |
|||
| 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 | ||||
| Description | alt | broader | narrower | related |
| asymptotic giant branch (asymptoticGiantBranch) | ||||
|
asymptotic giant branch |
AGB |
Hertzsprung-Russell diagram
, late-type giant , post-asymptotic giant branch |
||
| ataxite (ataxite) | ||||
|
ataxite |
meteorite | |||
| atlas (atlas) | ||||
|
atlas |
chart | star atlas |
catalog
, finding chart , map , sky survey , survey |
|
| atmosphere (atmosphere) | ||||
|
atmosphere |
Earth atmosphere
, stellar atmosphere |
aeronomy
, air , boundary layer , greenhouse effect , limb brightening , limb darkening , macroturbulence , microturbulence , opacity , planet , radiation belt , refraction angle , scale height , scintillation , temperature zone , water vapor |
||
| combine with other terms | ||||
| atmospheric density (atmosphericDensity) | ||||
|
atmospheric density |
density | scale height | ||
| atmospheric extinction (atmosphericExtinction) | ||||
|
atmospheric extinction |
extinction |
absorption
, scattering |
Earth atmosphere
, absorption coefficient , atmospheric window , light absorption , light scattering , ultraviolet extinction |
|
| refers to Earth atmosphere | ||||
| atmospheric radiation (atmosphericRadiation) | ||||
|
atmospheric radiation |
sky radiation |
afterglow
, airglow , ashen light , aurora , terrestrial radiation |
sky brightness | |
| ES: moved terrestrial_radiation from BT to NT (2007-OCT-8) | ||||
| atmospheric refraction (atmosphericRefraction) | ||||
|
atmospheric refraction |
active optics
, adaptive optics , atmospheric scintillation , point spread function , refractive index , scintillation , seeing , speckle |
|||
| atmospheric scattering (atmosphericScattering) | ||||
|
atmospheric scattering |
Earth atmosphere
, absorption |
|||
| atmospheric scintillation (atmosphericScintillation) | ||||
|
atmospheric scintillation |
twinkling | scintillation |
Earth atmosphere
, atmospheric refraction , seeing |
|
| 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 | ||||
| Description | alt | broader | narrower | related |
| atmospheric tide (atmosphericTide) | ||||
|
atmospheric tide |
tide | |||
| atmospheric window (atmosphericWindow) | ||||
|
atmospheric window |
window |
infrared transmission window
, optical transmission window , radio transmission window |
Earth atmosphere
, absorption , atmospheric extinction , transparency |
|
| spectral ranges transmitted by the Earth's atmosphere | ||||
| atom (atom) | ||||
|
atom |
matter | fundamental chemical element | chemical element | |
| atomic clock (atomicClock) | ||||
|
atomic clock |
caesium clock
, cesium clock |
clock
, measuring instrument |
atomic time
, geodesy , time , time standard , time synchronization , very long baseline interferometry |
|
| atomic line (atomicLine) | ||||
|
atomic line |
atomic spectrum | |||
| atomic physics (atomicPhysics) | ||||
|
atomic physics |
scientific field | |||
| atomic process (atomicProcess) | ||||
|
atomic process |
absorption line
, emission line , equation of state , excitation , population inversion |
|||
| atomic spectrum (atomicSpectrum) | ||||
|
atomic spectrum |
absorption spectrum
, spectrum |
atomic line | ||
| atomic time (atomicTime) | ||||
|
atomic time |
atomic clock | |||
| attenuation (attenuation) | ||||
|
attenuation |
filter
, neutral density filter |
|||
| 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 | ||||
| Description | alt | broader | narrower | related |
| aurora (aurora) | ||||
|
aurora |
atmospheric radiation |
auroral arc
, auroral jet |
Rayleigh
, airglow , light emission , magnetic disturbances , magnetic pole , magnetic storm , night sky brightness , photoionization , sky brightness , solar activity , upper atmosphere |
|
| auroral arc (auroralArc) | ||||
|
auroral arc |
arc
, aurora |
|||
| auroral jet (auroralJet) | ||||
|
auroral jet |
aurora | |||
| australite (australite) | ||||
|
australite |
meteorite
, tektite |
bediasite
, chondrite , moldavite |
||
| auto-correlation (autoCorrelation) | ||||
|
auto-correlation |
autocorrelation | correlation |
cross-correlation
, data processing |
|
| FVH: new (2007-NOV-1) | ||||
| autoguider (autoguider) | ||||
|
autoguider |
control system
, guide system |
automatic patrol telescope
, quadrant detector , tracking |
||
| automated telescope (automatedTelescope) | ||||
|
automated telescope |
robotic telescope | telescope | automatic patrol telescope | remote control system |
| automatic patrol telescope (automaticPatrolTelescope) | ||||
|
automatic patrol telescope |
automated telescope
, optical telescope |
autoguider
, photometry , remote control system |
||
| autumnal equinox (autumnalEquinox) | ||||
|
autumnal equinox |
equinox | vernal equinox | ||
| auxiliary instrument (auxiliaryInstrument) | ||||
|
auxiliary instrument |
instrument | |||
| 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 | ||||
| Description | alt | broader | narrower | related |
| avalanche photodiode (avalanchePhotodiode) | ||||
|
avalanche photodiode |
photodiode
, photoelectronic device |
photometry | ||
| axial ratio (axialRatio) | ||||
|
axial ratio |
ratio |
axis
, major axis , minor axis |
||
| ES: new (2007-OCT-11) | ||||
| axion (axion) | ||||
|
axion |
elementary particle | |||
| axis (axis) | ||||
|
axis |
axial ratio | |||
| combine with other terms | ||||
| azimuth (azimuth) | ||||
|
azimuth |
bearing |
altazimuth mounting
, altitude angle , horizon , horizon coordinate system |
||