This page lists the 120 pre-defined sites in airmass.org. The list was based originally on some data from astropy, in which I have subsequently fixed many errors and added many new sites.

Light pollution data is taken from the World Atlas of the Artificial Night Sky Brightness 2016, and the naked-eye limiting magnitude at the zenith is estimated from the light pollution data using equations from Schaefer 1990 (PASP, 102, 212). In practice, the age, acuity and experience of the observer, and local geography at the observing site, can yield significantly different limiting magnitudes.

IDNameCountryLatitude (°)Longitude (°)Elevation (m)Light pollutionLimiting magnitude
aaoAustralian Astronomical ObservatoryAustralia31° 16' 31.38" S149° 04' 02.03" E1136negligible6.8
aipLeibniz-Institut für Astrophysik PotsdamGermany52° 24' 17.87" N13° 06' 15.38" E67very bad5.5
aliAli ObservatoryChina32° 19' 34.72" N80° 01' 32.88" E5035negligible6.8
almaAtacama Large Millimeter ArrayChile23° 01' 44.40" S67° 45' 18.00" W5035negligible6.8
apexAtacama Pathfinder ExperimentChile23° 00' 41.32" S67° 46' 42.97" W5058negligible6.8
apoApache Point ObservatoryUnited States32° 46' 48.00" N105° 49' 12.00" W2798low6.7
apoaAnton Pannekoek ObservatoryNetherlands52° 21' 15.66" N04° 57' 17.84" E0extreme4.6
areciboArecibo ObservatoryPuerto Rico18° 20' 39.12" N66° 45' 09.72" W238bad6.1
armaghArmagh ObservatoryUnited Kingdom54° 21' 07.63" N06° 38' 54.47" W52bad6.1
asiagoOsservatorio Astrofisico di AsiagoItaly45° 51' 59.41" N11° 31' 35.22" E1034bad5.8
atcaAustralia Telescope Compact ArrayAustralia30° 18' 46.08" S149° 33' 54.00" E209very low6.8
baoBeijing XingLong ObservatoryChina40° 23' 44.52" N117° 34' 33.24" E950moderate6.6
biruniBiruni ObservatoryIran29° 39' 00.95" N52° 30' 16.34" E1705extreme4.2
calanObservatorio Astronómico Nacional de ChileChile33° 23' 43.80" S70° 32' 11.23" W859very bad5.1
calaraltoCalar AltoSpain37° 13' 25.00" N02° 32' 46.00" W2158low6.7
caoCrimean Astrophysical ObservatoryUkraine44° 43' 27.96" N34° 00' 35.64" E578low6.7
casleoLeoncito Astronomical ComplexArgentina31° 47' 55.02" S69° 17' 44.24" W2482very low6.8
cfhtCanada-France-Hawaii TelescopeUnited States19° 49' 30.96" N155° 28' 07.67" W4215very low6.8
ctioCerro Tololo Interamerican ObservatoryChile30° 10' 08.40" S70° 48' 22.32" W2215very low6.8
daoDominion Astrophysical ObservatoryCanada48° 31' 11.31" N123° 25' 06.00" W229bad5.8
dctDiscovery Channel TelescopeUnited States34° 44' 39.50" N111° 25' 21.05" W2337very low6.7
draoDominion Radio Astrophysical ObservatoryCanada49° 19' 17.57" N119° 37' 11.99" W546low6.7
dwingelooDwingeloo Radio ObservatoryNetherlands52° 48' 43.55" N06° 23' 47.02" E14moderate6.5
effelsbergEffelsberg 100m telescopeGermany50° 31' 30.36" N06° 52' 59.16" E328bad6.3
ekarMount Ekar 182 cm. TelescopeItaly45° 50' 54.73" N11° 34' 08.51" E1413bad6.1
eltEuropean Extremely Large TelescopeChile24° 35' 21.48" S70° 11' 29.76" W3060negligible6.8
fast500m-aperture Spherical TelescopeChina25° 39' 10.44" N106° 51' 23.80" E853very low6.7
flwoWhipple ObservatoryUnited States31° 40' 51.57" N110° 52' 42.04" W2320low6.7
gboGreen Bank ObservatoryUnited States38° 25' 59.52" N79° 50' 22.92" W806low6.7
gemnGemini NorthUnited States19° 49' 25.69" N155° 28' 08.57" W4213very low6.8
gemsGemini SouthChile30° 14' 26.67" S70° 44' 12.06" W2750very low6.8
griffithGriffith ObservatoryUnited States34° 07' 08.11" N118° 18' 01.51" W346extreme3.7
haleakalaHaleakala ObservatoriesUnited States20° 42' 29.32" N156° 15' 24.22" W3048very low6.7
halleyHalley's MountSaint Helena15° 57' 44.82" S05° 41' 58.06" W659negligible6.8
hanfordLIGO (Hanford)United States46° 27' 18.52" N119° 24' 27.56" W162moderate6.5
iaoIndian Astronomical ObservatoryIndia32° 46' 45.98" N78° 57' 51.00" E4486negligible6.8
icaoINAF Catania Astrophysical ObservatoryItaly37° 41' 35.18" N14° 58' 28.00" E1733bad5.8
igoIUCAA Girawali ObservatoryIndia19° 04' 22.55" N73° 50' 41.09" E981moderate6.5
ilmtInternational Liquid Mirror TelescopeIndia29° 21' 39.39" N79° 41' 03.69" E2398moderate6.6
iramIRAM 30m telescopeSpain37° 03' 59.04" N03° 23' 32.64" W2843bad6.3
irtfNASA Infrared Telescope FacilityUnited States19° 49' 34.39" N155° 28' 19.20" W4168very low6.8
ishigakiIshigaki Astronomical ObservatoryJapan24° 22' 23.92" N124° 08' 21.18" E182moderate6.5
jcmtJames Clerk Maxwell TelescopeUnited States19° 49' 22.15" N155° 28' 37.06" W4072very low6.8
jodrellJodrell Bank ObservatoryUnited Kingdom53° 14' 12.48" N02° 18' 30.60" W89bad5.8
keckW. M. Keck ObservatoryUnited States19° 49' 34.67" N155° 28' 27.95" W4160very low6.8
kpnoKitt Peak National ObservatoryUnited States31° 57' 48.00" N111° 35' 60.00" W2120low6.7
lapalmaRoque de los Muchachos, La PalmaSpain28° 45' 38.31" N17° 52' 54.41" W2327low6.7
lasillaLa Silla Observatory (ESO)Chile29° 15' 32.40" S70° 44' 01.68" W2347negligible6.8
lbtLarge Binocular TelescopeUnited States32° 42' 05.76" N109° 53' 19.32" W2902low6.7
lcoLas Campanas ObservatoryChile29° 00' 51.12" S70° 41' 33.00" W2282negligible6.8
lhkLandessternwarte Heidelberg-KönigstuhlGermany49° 23' 53.32" N08° 43' 29.58" E561bad5.8
lickLick ObservatoryUnited States37° 20' 36.00" N121° 38' 12.00" W1290bad6.1
livingstonLIGO (Livingston)United States30° 33' 46.42" N90° 46' 27.27" W18bad5.8
lmtLarge Millimeter TelescopeMexico18° 59' 10.32" N97° 18' 53.28" W4563moderate6.5
loianoLoiano ObservatoryItaly44° 15' 32.95" N11° 20' 03.98" E753bad6.1
lowellLowell ObservatoryUnited States35° 05' 48.00" N111° 32' 06.00" W2198moderate6.6
mcdonaldMcDonald ObservatoryUnited States30° 40' 18.00" N104° 01' 18.00" W2075very low6.8
mdmMichigan-Dartmouth-MIT ObservatoryUnited States31° 57' 11.87" N111° 36' 53.65" W1938low6.7
medicinaMedicina Radio TelescopeItaly44° 31' 13.80" N11° 38' 48.84" E25bad5.8
metsahoviMetsähovi Radio ObservatoryFinland60° 13' 04.13" N24° 23' 35.27" E51very bad5.5
midiObservatoire du Pic du MidiFrance42° 56' 11.93" N00° 08' 29.29" E2829moderate6.6
miroMount Abu InfraRed ObservatoryIndia24° 39' 11.15" N72° 46' 47.43" E1680moderate6.6
mmtMultiple Mirror TelescopeUnited States31° 41' 18.00" N110° 53' 06.00" W2608low6.7
molongloMolonglo Observatory Synthesis TelescopeAustralia35° 22' 14.78" S149° 25' 41.50" E736very low6.7
mraoMurchison Radio-astronomy ObservatoryAustralia26° 41' 49.30" S116° 37' 51.82" E374negligible6.8
mroManastash Ridge ObservatoryUnited States46° 57' 03.95" N120° 43' 28.33" W1198moderate6.6
msoMt. Stromlo ObservatoryAustralia35° 19' 08.87" S149° 00' 31.89" E767bad6.3
mtbigelowCatalina Observatory: 61 inch telescopeUnited States32° 25' 00.00" N110° 43' 54.00" W2510bad6.3
mullardMullard Radio Astronomy ObservatoryUnited Kingdom52° 10' 02.36" N00° 01' 57.88" E21bad6.1
mwoMount Wilson ObservatoryUnited States34° 13' 33.24" N118° 03' 25.20" W1742very bad5.1
ngtsNext-Generation Transit SurveyChile24° 36' 57.85" S70° 23' 25.97" W2440negligible6.8
nhaoNishi-Harima Astronomical ObservatoryJapan35° 01' 31.14" N134° 20' 07.53" E432moderate6.6
nobeyamaNobeyama 45m TelescopeJapan35° 56' 40.27" N138° 28' 20.71" E1347moderate6.5
notoNoto Radio TelescopeItaly36° 52' 33.06" N14° 59' 20.04" E30bad6.1
novNational Observatory of VenezuelaVenezuela08° 47' 14.60" N70° 52' 12.54" W3610moderate6.6
oajObservatorio Astrofísico de JavalambreSpain40° 02' 31.24" N01° 00' 58.27" W1954low6.7
oancObservatorio Astronómico Nacional de ColombiaColombia04° 38' 22.90" N74° 04' 59.99" W2555extreme3.7
oaoOkayama Astrophysical ObservatoryJapan34° 34' 37.69" N133° 35' 37.85" E371bad6.1
oavdaVal d'Aosta ObservatoryItaly45° 47' 23.18" N07° 28' 42.19" E1673bad6.3
ocaObservatoire de de la Côte d’AzurFrance43° 43' 38.17" N07° 17' 56.80" E349extreme4.6
ohpObservatoire de Haute ProvenceFrance43° 55' 51.00" N05° 42' 48.00" E650moderate6.5
olinOlin Science CenterUnited States41° 22' 44.65" N72° 06' 16.57" W65very bad5.1
oliverOliver Observing StationUnited States36° 18' 21.34" N121° 34' 00.33" W1518low6.7
onsalaOnsala Space ObservatorySweden57° 23' 35.00" N11° 55' 03.79" E18bad6.3
palomarPalomar ObservatoryUnited States33° 21' 21.60" N116° 51' 46.80" W1706bad6.3
paranalParanal Observatory (ESO)Chile24° 37' 39.00" S70° 24' 16.20" W2635negligible6.8
parkesParkes 64m TelescopeAustralia32° 59' 52.01" S148° 15' 46.51" E378negligible6.8
pdbPlateau de Bure InterferometerFrance44° 38' 03.12" N05° 54' 28.80" E2551moderate6.6
pddoObservatório Pico dos DiasBrazil22° 32' 05.39" S45° 34' 58.90" W1847low6.7
peytonPeyton ObservatoryUnited States40° 20' 47.75" N74° 39' 06.12" W45very bad5.1
pulkovoPulkovo ObservatoryRussia59° 46' 18.48" N30° 19' 34.25" E81extreme3.7
roanjaseLos Nogales de Roan JaseChile33° 43' 00.92" S70° 19' 50.66" W1070moderate6.6
roeRoyal Observatory, EdinburghUnited Kingdom55° 55' 23.66" N03° 11' 16.35" W128extreme4.6
rogRoyal Observatory GreenwichUnited Kingdom51° 28' 40.12" N00° 00' 05.31" W46extreme3.7
rozhenBulgarian National Astronomical ObservatoryBulgaria41° 41' 35.26" N24° 44' 19.81" E1732low6.7
saltSouthern African Large TelescopeSouth Africa32° 22' 32.96" S20° 48' 38.91" E1798negligible6.8
saorasSpecial Astrophysical ObservatoryRussia43° 38' 48.60" N41° 26' 25.60" E2064very low6.7
sireneObservatoire SireneFrance44° 00' 00.00" N05° 29' 13.00" E1100moderate6.5
skaSquare Kilometre ArraySouth Africa30° 43' 17.61" S21° 24' 38.60" E1054negligible6.8
skinakasSkinakas ObservatoryGreece35° 12' 42.43" N24° 53' 56.70" E1732moderate6.6
smaSubmillimeter ArrayUnited States19° 49' 28.12" N155° 28' 43.03" W4073very low6.8
southamGordon Southam ObservatoryCanada49° 16' 31.55" N123° 08' 36.98" W10extreme4.2
spmObservatorio Astronomico Nacional, San Pedro MartirMexico31° 02' 39.60" N115° 27' 49.50" W2830very low6.8
sptSouth Pole Telescope-90° 00' 00.00" S180° 00' 00.00" E2800negligible6.8
srtSardinia Radio TelescopeItaly39° 29' 34.94" N09° 14' 42.58" E650moderate6.5
subaruSubaru TelescopeUnited States19° 49' 32.00" N155° 28' 34.00" W4139very low6.8
teideTeide ObservatorySpain28° 18' 03.96" N16° 30' 38.52" W2390bad6.3
tonaObservatorio Astronomico Nacional, TonantzintlaMexico19° 01' 53.61" N98° 18' 56.34" W2174extreme4.6
ucloUniversity College London ObservatoryUnited Kingdom51° 36' 48.06" N00° 14' 32.12" W77extreme4.2
ucmjoUniversity of Canterbury Mount John ObservatoryNew Zealand43° 59' 07.19" S170° 27' 53.70" E1028very low6.8
ufrjObservatório do ValongoBrazil22° 53' 54.82" S43° 11' 11.97" W23very bad5.1
vboVainu Bappu ObservatoryIndia12° 34' 29.56" N78° 49' 13.24" E725moderate6.6
venusPointe VénusFrench Polynesia17° 29' 39.44" S149° 29' 39.67" W0low6.7
vidojevicaAstronomical Station VidojevicaSerbia43° 08' 28.30" N21° 33' 20.80" E1145moderate6.6
viennaVienna ObservatoryAustria48° 13' 55.00" N16° 20' 03.00" E229extreme4.6
vistaVISTAChile24° 36' 57.08" S70° 23' 51.23" W2503negligible6.8
vlaVery Large ArrayUnited States34° 04' 43.50" N107° 37' 05.82" W2124very low6.8
wendelsteinWendelstein ObservatoryGermany47° 42' 13.53" N12° 00' 44.09" E1784moderate6.6
wiseWise ObservatoryIsrael30° 35' 50.26" N34° 45' 43.94" E863bad6.3
wrightWright's TowerUnited Kingdom54° 40' 26.94" N01° 37' 44.48" W198bad5.8