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

Monte Mario Observatory
Osservatorio Astronomico di Roma.jpg
Observatory code 034 Edit this on Wikidata
LocationRome, Italy Edit this at Wikidata
Coordinates41°55′21″N 12°27′09″E / 41.9225°N 12.4525°E / 41.9225; 12.4525Coordinates: 41°55′21″N 12°27′09″E / 41.9225°N 12.4525°E / 41.9225; 12.4525 Edit this at Wikidata
Monte Mario Observatory is located in Italy
Monte Mario Observatory
Location of Monte Mario Observatory
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