english word · 2026-10-05

ephemeris

noun

Meaning

A table or data file providing the calculated positions of celestial bodies at regular intervals throughout a period of time. In astrology, it is the essential reference tool used to track planetary movements and calculate birth charts.

Etymology

Derived from the Greek 'ephēmeros', meaning 'lasting only a day', via the Latin 'ephemeris' for a diary or calendar.

Examples

"I checked the ephemeris to see exactly when Pluto would finally move into Aquarius."

"Before the era of apps, every astrologer kept a thick, printed ephemeris on their desk to track the daily transits."

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