This page lists the 104 pre-defined sites in observability.date. The list was based originally on some data from astropy, in which I have subsequently fixed many errors and added many new sites. You can download the raw data file here.

Light pollution data is taken from the World Atlas of the Artificial Night Sky Brightness, 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.

IDNameLatitude (°)Longitude (°)Elevation (m)Light pollutionLimiting magnitude
aipLeibniz-Institut für Astrophysik Potsdam52° 24' 17.87" N13° 06' 15.38" E67very bad5.5
aaoAustralian Astronomical Observatory31° 16' 31.38" S149° 04' 02.03" E1136negligible6.8
aliAli Observatory32° 19' 34.72" N80° 01' 32.88" E5035negligible6.8
almaAtacama Large Millimeter Array23° 01' 44.40" S67° 45' 18.00" W5035negligible6.8
apexAtacama Pathfinder Experiment23° 00' 41.32" S67° 46' 42.97" W5058negligible6.8
apoApache Point Observatory32° 46' 48.00" N105° 49' 12.00" W2798low6.7
areciboArecibo Observatory18° 20' 39.12" N66° 45' 09.72" W238bad6.1
atcaAustralia Telescope Compact Array30° 18' 46.08" S149° 33' 54.00" E209very low6.8
baoBeijing XingLong Observatory40° 23' 44.52" N117° 34' 33.24" E950moderate6.6
biruniBiruni Observatory29° 39' 00.95" N52° 30' 16.34" E1705extreme4.2
calanObservatorio Astronómico Nacional de Chile33° 23' 43.80" S70° 32' 11.23" W859extreme4.6
calaraltoCalar Alto37° 13' 25.00" N02° 32' 46.00" W2158low6.7
caoCrimean Astrophysical Observatory44° 43' 27.96" N34° 00' 35.64" E578low6.7
cfhtCanada-France-Hawaii Telescope19° 49' 30.96" N155° 28' 07.67" W4215very low6.8
ctioCerro Tololo Interamerican Observatory30° 10' 08.40" S70° 48' 22.32" W2215very low6.8
daoDominion Astrophysical Observatory48° 31' 18.00" N123° 25' 00.00" W229bad5.8
dctDiscovery Channel Telescope34° 44' 39.50" N111° 25' 21.05" W2337very low6.7
dwingelooDwingeloo Radio Observatory52° 48' 43.55" N06° 23' 47.02" E14bad6.3
effelsbergEffelsberg 100m telescope50° 31' 30.36" N06° 52' 59.16" E328bad6.3
ekarMt. Ekar 182 cm. Telescope45° 50' 54.92" N11° 34' 52.08" E1413bad6.1
eltEuropean Extremely Large Telescope24° 35' 21.48" S70° 11' 29.76" W3060negligible6.8
fast500m-aperture Spherical Telescope25° 39' 10.44" N106° 51' 23.80" E853very low6.8
flwoWhipple Observatory31° 40' 51.40" N110° 52' 39.00" W2320low6.7
gboGreen Bank Observatory38° 25' 59.52" N79° 50' 22.92" W806moderate6.6
gemnGemini North19° 49' 25.69" N155° 28' 08.57" W4213very low6.8
gemsGemini South30° 14' 26.67" S70° 44' 12.06" W2750very low6.8
griffithGriffith Observatory34° 07' 08.11" N118° 18' 01.51" W346extreme3.7
haleakalaHaleakala Observatories20° 42' 29.32" N156° 15' 24.22" W3048very low6.7
halleyHalley's Mount15° 57' 44.82" S05° 41' 58.06" W659very low6.7
hanfordLIGO (Hanford)46° 27' 18.52" N119° 24' 27.56" W162moderate6.5
iaoIndian Astronomical Observatory32° 46' 45.98" N78° 57' 51.00" E4486negligible6.8
igoIUCAA Girawali Observatory19° 04' 22.55" N73° 50' 41.09" E981moderate6.5
iramIRAM 30m telescope37° 03' 59.04" N03° 23' 32.64" W2843moderate6.5
irtfNASA Infrared Telescope Facility19° 49' 34.39" N155° 28' 19.20" W4168very low6.8
ishigakiIshigaki Astronomical Observatory24° 22' 23.92" N124° 08' 21.18" E182bad6.3
jcmtJames Clerk Maxwell Telescope19° 49' 22.15" N155° 28' 37.06" W4072very low6.8
jodrellJodrell Bank Observatory53° 14' 12.48" N02° 18' 30.60" W89bad5.8
keckW. M. Keck Observatory19° 49' 34.67" N155° 28' 27.95" W4160very low6.8
kpnoKitt Peak National Observatory31° 57' 48.00" N111° 35' 60.00" W2120low6.7
lapalmaRoque de los Muchachos, La Palma28° 45' 30.00" N17° 52' 48.00" W2327low6.7
lasillaLa Silla Observatory (ESO)29° 15' 32.40" S70° 44' 01.68" W2347negligible6.8
lbtLarge Binocular Telescope32° 42' 05.76" N109° 53' 19.32" W2902low6.7
lcoLas Campanas Observatory29° 00' 51.12" S70° 41' 33.00" W2282negligible6.8
lhkLandessternwarte Heidelberg-Königstuhl49° 23' 53.32" N08° 43' 29.58" E561very bad5.5
lickLick Observatory37° 20' 36.00" N121° 38' 12.00" W1290bad6.1
livingstonLIGO (Livingston)30° 33' 46.42" N90° 46' 27.27" W18bad6.1
lmtLarge Millimeter Telescope18° 59' 10.32" N97° 18' 53.28" W4563moderate6.6
lowellLowell Observatory35° 05' 48.00" N111° 32' 06.00" W2198low6.7
mcdonaldMcDonald Observatory30° 40' 18.00" N104° 01' 18.00" W2075very low6.8
mdmMichigan-Dartmouth-MIT Observatory31° 56' 60.00" N111° 37' 00.00" W1938low6.7
medicinaMedicina Radio Telescope44° 31' 13.80" N11° 38' 48.84" E25bad6.1
midiObservatoire du Pic du Midi42° 56' 11.93" N00° 08' 29.29" E2829moderate6.5
miroMount Abu InfraRed Observatory24° 39' 17.34" N72° 46' 45.18" E1680low6.7
mmtMultiple Mirror Telescope31° 41' 18.00" N110° 53' 06.00" W2608low6.7
molongloMolonglo Observatory Synthesis Telescope35° 22' 14.78" S149° 25' 41.50" E736low6.7
mraoMurchison Radio-astronomy Observatory26° 41' 49.30" S116° 37' 51.82" E374negligible6.8
mroManastash Ridge Observatory46° 57' 10.08" N120° 43' 40.08" W1198moderate6.6
msoMt. Stromlo Observatory35° 19' 14.34" S149° 01' 27.60" E767bad5.8
mtbigelowCatalina Observatory: 61 inch telescope32° 25' 00.00" N110° 43' 54.00" W2510bad6.3
mullardMullard Radio Astronomy Observatory52° 10' 02.36" N00° 01' 57.88" E21bad5.8
mwoMount Wilson Observatory34° 13' 33.24" N118° 03' 25.20" W1742very bad5.1
nobeyamaNobeyama 45m Telescope35° 56' 40.27" N138° 28' 20.71" E1347bad6.3
notoNoto Radio Telescope36° 52' 33.06" N14° 59' 20.04" E30bad6.1
novNational Observatory of Venezuela08° 47' 24.00" N70° 52' 00.00" W3610moderate6.6
oajObservatorio Astrofísico de Javalambre40° 02' 31.24" N01° 00' 58.27" W1954low6.7
oaoOkayama Astrophysical Observatory34° 34' 37.69" N133° 35' 37.85" E371bad5.8
oancObservatorio Astronómico Nacional de Colombia04° 38' 22.90" N74° 04' 59.99" W2555extreme4.2
ocaObservatoire de de la Côte d’Azur43° 43' 38.17" N07° 17' 56.80" E349very bad5.1
ohpObservatoire de Haute Provence43° 55' 51.00" N05° 42' 48.00" E650bad6.3
olinOlin Science Center41° 22' 44.65" N72° 06' 16.57" W65very bad5.1
onsalaOnsala Space Observatory57° 23' 35.00" N11° 55' 03.79" E18bad6.3
palomarPalomar Observatory33° 21' 21.60" N116° 51' 46.80" W1706bad6.3
paranalParanal Observatory (ESO)24° 37' 39.00" S70° 24' 16.20" W2635negligible6.8
parkesParkes 64m Telescope32° 59' 52.01" S148° 15' 46.51" E378very low6.8
pdbPlateau de Bure Interferometer44° 38' 03.12" N05° 54' 28.80" E2551moderate6.5
pddoObservatório Pico dos Dias22° 32' 05.39" S45° 34' 58.90" W1847moderate6.6
peytonPeyton Observatory40° 20' 47.75" N74° 39' 06.12" W45very bad5.1
pulkovoPulkovo Observatory59° 46' 18.48" N30° 19' 34.25" E81extreme4.6
roanjaseLos Nogales de Roan Jase33° 43' 00.92" S70° 19' 50.66" W1070moderate6.5
roeRoyal Observatory, Edinburgh55° 55' 23.66" N03° 11' 16.35" W128very bad5.1
rogRoyal Observatory Greenwich51° 28' 40.12" N00° 00' 05.31" W46extreme4.2
saltSouthern African Large Telescope32° 22' 32.96" S20° 48' 38.91" E1798negligible6.8
saorasSpecial Astrophysical Observatory43° 38' 48.60" N41° 26' 25.60" E2064very low6.8
sireneObservatoire SIRENE44° 00' 00.00" N05° 29' 13.00" E1100moderate6.5
skaSquare Kilometre Array30° 43' 17.61" S21° 24' 38.60" E1054negligible6.8
skinakasSkinakas Observatory35° 12' 42.43" N24° 53' 56.70" E1732moderate6.6
smaSubmillimeter Array19° 49' 28.12" N155° 28' 43.03" W4073very low6.8
southamGordon Southam Observatory49° 16' 31.55" N123° 08' 36.98" W10extreme4.6
spmObservatorio Astronomico Nacional, San Pedro Martir31° 02' 39.60" N115° 27' 49.50" W2830very low6.8
sptSouth Pole Telescope90° 00' 00.00" S180° 00' 00.00" E2800negligible6.8
srtSardinia Radio Telescope39° 29' 34.94" N09° 14' 42.58" E650moderate6.5
subaruSubaru Telescope19° 49' 32.00" N155° 28' 34.00" W4139very low6.8
teideTeide Observatory28° 18' 03.96" N16° 30' 38.52" W2390bad6.3
tonaObservatorio Astronomico Nacional, Tonantzintla19° 01' 58.00" N98° 18' 50.00" W2174very bad5.1
ucloUniversity College London Observatory51° 36' 48.06" N00° 14' 32.12" W77extreme4.6
ucmjoUniversity of Canterbury Mount John Observatory43° 59' 07.19" S170° 27' 53.70" E1028very low6.8
ufrjObservatório do Valongo22° 53' 54.82" S43° 11' 11.97" W23extreme4.6
vboVainu Bappu Observatory12° 34' 35.98" N78° 49' 35.76" E725moderate6.6
vidojevicaAstronomical Station Vidojevica43° 08' 28.30" N21° 33' 20.80" E1145low6.7
viennaVienna Observatory48° 13' 55.00" N16° 20' 03.00" E229extreme4.6
vlaVery Large Array34° 04' 43.50" N107° 37' 05.82" W2124very low6.8
wendelsteinWendelstein Observatory47° 42' 13.53" N12° 00' 44.09" E1784bad6.3
wiseWise Observatory30° 35' 50.26" N34° 45' 43.94" E863moderate6.5
wrightWright's Tower54° 40' 26.94" N01° 37' 44.48" W198very bad5.5