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Was Established 1851 And Set As The World's "Prime Meridian" In 1884. Its Location Is Marked In A Number Of Places Within The Site.
Paris Was The Main "Competitor" To The Choice Of Greenwich At The Conference Of Washington. France Did Not Immediately Accept The Decision Of That Conference And Continued To Use The Paris Line For Some Time Thereafter. The Line Is Based On The Location Of The Paris Observatory Which Is Outside The Inscribed Area, But A Line Of Markers Called The Arago Medallions (Named After A French Astronomer) Follows The Line Across Paris And The Louvre Area (Within The Inscribed Boundaries) Contains A Significant Number.
See Tions.Net
See Tions.Net
The "Pulkovo Meridian" Was The Base Point For All Geographical Maps Of Russia. It Ran Through The Main Hall Of The Pulkovo Observatory.
See Www.Gao.Spb.Ru
See Www.Gao.Spb.Ru
Used As The Zero-Point For Graeco-Roman Cartography (Nomin File Annex - "History Of Science")