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.

Observatorycode 034 

Location, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Coordinates41°55′21″N 12°27′09″E

Altitude128 m (420 ft)

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Monte Mario Observatory

Observatory code	034
Location	, Rome, Metropolitan City of Rome Capital, Lazio, Italy
Coordinates	41°55′21″N 12°27′09″E
Altitude	128 m (420 ft)
Established	1923
Website	www.oa-roma.inaf.it/oar/monte-mario/
Location of Monte Mario Observatory
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