This page lists the 101 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 E67  very bad5.5
aaoAustralian Astronomical Observatory31 16 37.34 S149 03 57.91 E1164  negligible6.8
aliAli Observatory32 19 34.72 N80 01 32.88 E5035  negligible6.8
almaAtacama Large Millimeter Array23 01 44.40 S67 45 18.00 W5000  negligible6.8
apexAtacama Pathfinder Experiment23 00 41.32 S67 46 42.97 W5058  negligible6.8
apoApache Point Observatory32 46 48.00 N105 49 12.00 W2798  low6.7
areciboArecibo Observatory18 20 39.12 N66 45 9.72 W238  bad6.1
atcaAustralia Telescope Compact Array30 18 46.08 S149 33 54.00 E209  very low6.8
baoBeijing XingLong Observatory40 23 44.52 N117 34 33.24 E950  moderate6.6
biruniBiruni Observatory29 39 0.95 N52 30 16.34 E1705  extreme4.2
calanObservatorio Astronómico Nacional de Chile33 23 43.80 S70 32 11.23 W859  extreme4.6
calaraltoCalar Alto37 13 25.00 N02 32 46.00 W2158  low6.7
caoCrimean Astrophysical Observatory44 43 27.96 N34 00 35.64 E578  low6.7
cfhtCanada-France-Hawaii Telescope19 49 30.96 N155 28 7.67 W4215  very low6.8
ctioCerro Tololo Interamerican Observatory30 10 8.40 S70 48 22.32 W2215  very low6.8
daoDominion Astrophysical Observatory48 31 18.00 N123 25 0.00 W229  bad5.8
dctDiscovery Channel Telescope34 44 39.50 N111 25 21.05 W2337  very low6.7
effelsbergEffelsberg 100m telescope50 31 30.36 N06 52 59.16 E328  bad6.3
ekarMt. Ekar 182 cm. Telescope45 50 54.92 N11 34 52.08 E1413  bad6.1
eltEuropean Extremely Large Telescope24 35 21.48 S70 11 29.76 W3060  negligible6.8
fast500m-aperture Spherical Telescope25 39 10.44 N106 51 23.80 E853  very low6.8
flwoWhipple Observatory31 40 51.40 N110 52 39.00 W2320  low6.7
gboGreen Bank Observatory38 25 59.52 N79 50 22.92 W806  moderate6.6
gemnGemini North19 49 25.69 N155 28 8.57 W4213  very low6.8
gemsGemini South30 14 26.67 S70 44 12.06 W2750  very low6.8
griffithGriffith Observatory34 07 8.11 N118 18 1.51 W346  extreme3.7
haleakalaHaleakala Observatories20 42 55.87 N156 10 8.40 W3048  very low6.7
halleyHalley's Mount15 57 44.82 S05 41 58.06 W659  very low6.7
hanfordLIGO (Hanford)46 27 18.52 N119 24 27.56 W162  moderate6.5
iaoIndian Astronomical Observatory32 46 45.98 N78 57 51.00 E4486  negligible6.8
igoIUCAA Girawali Observatory19 04 22.55 N73 50 41.09 E981  moderate6.5
iramIRAM 30m telescope37 03 59.04 N03 23 32.64 W2843  moderate6.5
irtfNASA Infrared Telescope Facility19 49 34.39 N155 28 19.20 W4168  very low6.8
jcmtJames Clerk Maxwell Telescope19 49 22.15 N155 28 37.06 W4072  very low6.8
jodrellJodrell Bank Observatory53 14 12.48 N02 18 30.60 W89  bad5.8
keckW. M. Keck Observatory19 49 34.67 N155 28 27.95 W4160  very low6.8
kpnoKitt Peak National Observatory31 57 48.00 N111 35 60.00 W2120  low6.7
lapalmaRoque de los Muchachos, La Palma28 45 30.00 N17 52 48.00 W2327  low6.7
lasillaLa Silla Observatory (ESO)29 15 32.40 S70 44 1.68 W2347  negligible6.8
lbtLarge Binocular Telescope32 42 5.76 N109 53 19.32 W2902  low6.7
lcoLas Campanas Observatory29 00 51.12 S70 41 33.00 W2282  negligible6.8
lhkLandessternwarte Heidelberg-Königstuhl49 23 53.32 N08 43 29.58 E561  very bad5.5
lickLick Observatory37 20 36.00 N121 38 12.00 W1290  bad6.1
livingstonLIGO (Livingston)30 33 46.42 N90 46 27.27 W18  bad6.1
lmtLarge Millimeter Telescope18 59 10.32 N97 18 53.28 W4563  moderate6.6
lowellLowell Observatory35 05 48.00 N111 32 6.00 W2198  low6.7
mcdonaldMcDonald Observatory30 40 18.00 N104 01 18.00 W2075  very low6.8
mdmMichigan-Dartmouth-MIT Observatory31 56 60.00 N111 37 0.00 W1938  low6.7
medicinaMedicina Radio Telescope44 31 13.80 N11 38 48.84 E25  bad6.1
midiObservatoire du Pic du Midi42 56 11.93 N00 08 29.29 E2829  moderate6.5
miroMount Abu InfraRed Observatory24 39 17.34 N72 46 45.18 E1680  low6.7
mmtMultiple Mirror Telescope31 41 18.00 N110 53 6.00 W2608  low6.7
molongloMolonglo Observatory Synthesis Telescope35 22 14.78 S149 25 41.50 E736  low6.7
mraoMurchison Radio-astronomy Observatory26 41 49.30 S116 37 51.82 E374  negligible6.8
mroManastash Ridge Observatory46 57 10.08 N120 43 40.08 W1198  moderate6.6
msoMt. Stromlo Observatory35 19 14.34 S149 01 27.60 E767  bad5.8
mtbigelowCatalina Observatory: 61 inch telescope32 25 0.00 N110 43 54.00 W2510  bad6.3
mullardMullard Radio Astronomy Observatory52 10 2.36 N00 01 57.88 E21  bad5.8
mwoMount Wilson Observatory34 13 33.24 N118 03 25.20 W1742  very bad5.1
nobeyamaNobeyama 45m Telescope35 56 40.27 N138 28 20.71 E1347  bad6.3
notoNoto Radio Telescope36 52 33.06 N14 59 20.04 E30  bad6.1
novNational Observatory of Venezuela08 47 24.00 N70 52 0.00 W3610  moderate6.6
oajObservatorio Astrofísico de Javalambre40 02 31.24 N01 00 58.27 W1954  low6.7
oancObservatorio Astronómico Nacional de Colombia04 38 22.90 N74 04 59.99 W2555  extreme4.2
ocaObservatoire de de la Côte d’Azur43 43 38.17 N07 17 56.80 E349  very bad5.1
ohpObservatoire de Haute Provence43 55 51.00 N05 42 48.00 E650  bad6.3
olinOlin Science Center41 22 44.65 N72 06 16.57 W65  very bad5.1
onsalaOnsala Space Observatory57 23 35.00 N11 55 3.79 E18  bad6.3
palomarPalomar Observatory33 21 21.60 N116 51 46.80 W1706  bad6.3
paranalParanal Observatory (ESO)24 37 39.00 S70 24 16.20 W2635  negligible6.8
parkesParkes 64m Telescope32 59 52.01 S148 15 46.51 E378  very low6.8
pdbPlateau de Bure Interferometer44 38 3.12 N05 54 28.80 E2551  moderate6.5
pddoObservatório Pico dos Dias22 32 5.39 S45 34 58.90 W1847  moderate6.6
peytonPeyton Observatory40 20 47.75 N74 39 6.12 W45  very bad5.1
pulkovoPulkovo Observatory59 46 18.48 N30 19 34.25 E81  extreme4.6
roanjaseLos Nogales de Roan Jase33 43 0.92 S70 19 50.66 W1070  moderate6.5
roeRoyal Observatory, Edinburgh55 55 23.66 N03 11 16.35 W128  very bad5.1
rogRoyal Observatory Greenwich51 28 40.12 N00 00 5.31 W46  extreme4.2
saltSouthern African Large Telescope32 22 32.96 S20 48 38.91 E1798  negligible6.8
saorasSpecial Astrophysical Observatory43 38 48.60 N41 26 25.60 E2064  very low6.8
sireneObservatoire SIRENE44 00 0.00 N05 29 13.00 E1100  moderate6.5
skaSquare Kilometre Array30 43 17.61 S21 24 38.60 E1054  negligible6.8
smaSubmillimeter Array19 49 28.12 N155 28 43.03 W4073  very low6.8
southamGordon Southam Observatory49 16 31.55 N123 08 36.98 W10  extreme4.6
spmObservatorio Astronomico Nacional, San Pedro Martir31 02 39.60 N115 27 49.50 W2830  very low6.8
sptSouth Pole Telescope90 00 0.00 S180 00 0.00 E2800  negligible6.8
srtSardinia Radio Telescope39 29 34.94 N09 14 42.58 E650  moderate6.5
ssoSiding Spring Observatory31 16 24.10 S149 03 40.30 E1149  negligible6.8
subaruSubaru Telescope19 49 32.00 N155 28 34.00 W4139  very low6.8
teideTeide Observatory28 18 3.96 N16 30 38.52 W2390  bad6.3
tonaObservatorio Astronomico Nacional, Tonantzintla19 01 58.00 N98 18 50.00 W2174  very bad5.1
ucloUniversity College London Observatory51 36 48.06 N00 14 32.12 W77  extreme4.6
ucmjoUniversity of Canterbury Mount John Observatory43 59 7.19 S170 27 53.70 E1028  very low6.8
ufrjObservatório do Valongo22 53 54.82 S43 11 11.97 W23  extreme4.6
vboVainu Bappu Observatory12 34 35.98 N78 49 35.76 E725  moderate6.6
vidojevicaAstronomical Station Vidojevica43 08 28.30 N21 33 20.80 E1145  low6.7
viennaVienna Observatory48 13 55.00 N16 20 3.00 E229  extreme4.6
vlaVery Large Array34 04 43.50 N107 37 5.82 W2124  very low6.8
wendelsteinWendelstein Observatory47 42 13.53 N12 00 44.09 E1784  bad6.3
wiseWise Observatory30 35 50.26 N34 45 43.94 E863  moderate6.5
wrightWright's Tower54 40 26.94 N01 37 44.48 W198  very bad5.5