1/5 A proleptic calendar is one which is extended backwards in time prior to its official introduction. For example, https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar …
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2/5 The word "proleptic" comes from "prolepsis", the assignment of something to a period of time which precedes it https://en.wiktionary.org/wiki/prolepsis
3/5 Near as I can tell, the opposite of "prolepsis" is "analepsis" https://en.wiktionary.org/wiki/analepsis
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4/5 So, an analeptic calendar is one extended forwards in time after its official abandonment. E.g. Analeptic Julian Calendar
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5/5 What I mean is that despite this tweet CE 2020 will still occur, even humans aren't around to see it :3https://twitter.com/qntm/status/682909765006135296 …
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