ephemeris
noun
A table or data file giving the calculated positions of celestial objects at regular intervals. Plural is "ephemerides."
Etymology
From Greek "ephemeris" (diary, journal), from "ephemeros" (lasting only a day), from "epi" (on) + "hemera" (day). Originally meant a daily record.
Examples in Use
- 1.
"Astronomers consulted the ephemeris to track the comet's path."
- 2.
"The space mission relied on precise ephemeris data for navigation."
- 3.
"Ancient Babylonians created the earliest astronomical ephemerides."
Related Vocabulary
Synonyms
Related Words
Fun Fact
NASA's JPL maintains the most accurate ephemeris data for solar system objects. Their calculations account for subtle gravitational influences and enable spacecraft to navigate across billions of miles with remarkable precision.
Word Game Tips
Letters: 9 letters (E, P, H, E, M, E, R, I, S)
Scrabble Value: 16 points
Tip: Words ending in "IS" are often good scoring opportunities.
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