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ephemeris (ih-FEM-er-is) - n., a table giving the apparent position of celestial bodies throughout the year; an astronomical almanac containing such tables; software that calculates the apparent position of celestial bodies.
Of interest not just to astronomers, professional or amateur, but sailors before satellites became a thing -- very helpful for navigation. From Late Latin ephēmeris, from Ancient Greek ephēmerís, diary/account-book/day-book, from ephḗmeros, living but a day (from whence ephemeral), from ep(í), for + hēméra, day.
---L.
Of interest not just to astronomers, professional or amateur, but sailors before satellites became a thing -- very helpful for navigation. From Late Latin ephēmeris, from Ancient Greek ephēmerís, diary/account-book/day-book, from ephḗmeros, living but a day (from whence ephemeral), from ep(í), for + hēméra, day.
---L.
