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noun, masculine/feminine

éphéméride

/e.fe.me.ʁid/

noun, masculine/feminine/e.fe.me.ʁid/plural: éphémérides

block or tear-off calendar; the events that took place on a particular date in previous years; ephemeris (table giving the apparent position of celestial bodies throughout the year)

Borrowed from the Latin ephēmeris, itself a borrowing from the Ancient Greek ἐφημερῐ́ς (ephēmerĭ́s).