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Memory Beta, non-canon Star Trek Wiki
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Century Day was a celebration conducted in the United Federation of Planets.

On Stardate 1/0101.01, the celebrations at Luna and other colonies throughout colonized space were interrupted by news of the destruction of 5 Federation heavy cruisers by an unknown enemy. A single destroyer from the fleet had survived and managed to report the vessels had the shape of a giant, winged creature and it was later discovered to be ships belonging to the Romulan Star Empire. (FASA RPG module: The Romulans (FASA))

As the Federation did not exist by the time of the Earth-Romulan War, it is possible that Century Day was instead celebrated by either the Coalition of Planets or the United Earth government.
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