Monte Mario Observatory

The Monte Mario Observatory (Sede di Monte Mario, literally "Site of Monte Mario") is an astronomical observatory and is administratively part of the Observatory of Rome (Osservatorio Astronomico di Roma). It is located atop Monte Mario, near the right bank of the river Tiber, in the municipality of Rome, Italy. This location (12°27'8.4"E ) was used as the prime meridian (rather than that of Greenwich) for maps of Italy until the 1960s.

Monte Mario Observatory
Observatory code 034 
Location, Rome, Metropolitan City of Rome Capital, Lazio, Italy
Coordinates41°55′21″N 12°27′09″E
Altitude128 m (420 ft)
Established1923 
Websitewww.oa-roma.inaf.it/oar/monte-mario/
Location of Monte Mario Observatory
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