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27 January was a date.
In 1963, Kim Philby, who had disappeared four days previously, reappeared in Russia. (PROSE: Endgame [+]Terrance Dicks, BBC Eighth Doctor Adventures (BBC Books, 2000).)
In 1967, Earth's nations signed the Outer Space Treaty, which limited the use of the Moon and other celestial bodies for peaceful exploration. (PROSE: Time Traveller's Diary [+]Chris Farnell, BBC Children's Books (2020).)