Bee English Dictionary

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ephemeris
  • n  an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year
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ephemeris time
  • n  (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
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ephemeron
  • n  anything short-lived, as an insect that lives only for a day in its winged form
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