ephem·er·is /-mərəs/
 位置推算曆


 E·phem·e·ris n.; pl. Ephemerides
 1. A diary; a journal.
 2. Anat. (a) A publication giving the computed places of the heavenly bodies for each day of the year, with other numerical data, for the use of the astronomer and navigator; an astronomical almanac; as, the “American Ephemeris and Nautical Almanac.” (b) Any tabular statement of the assigned places of a heavenly body, as a planet or comet, on several successive days.
 3. Literature A collective name for reviews, magazines, and all kinds of periodical literature.

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 ephemeris
      n : an annual publication containing astronomical tables that
          give the positions of the celestial bodies throughout the
          year; "today computers calculate the ephemerides"
      [also: ephemerides (pl)]