ephemeral

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ephemeral existing only for a day or a very short time. XVI. f. Gr. ephḗmeros (whence fem. and n. in -a, -on as sbs.), f. EPI- + hēmérā day; see -AL1.
So ephemeris table showing the places of heavenly bodies for every day of a period XVI; astronomical almanac XVII. — L. — Gr. ephēmerís diary.

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