ephemeris [ɪˈfɛm(ə)rɪs, -ˈfiːm-] (pl. ephemerides ˌɛfɪˈmɛrɪdiːz)
(Astronomy & Astrology)a table or data file giving the calculated positions of a celestial object at regular intervals throughout a period (天文,占星)星历表 ■a book or set of such tables or files (带星历表的)历书
语源
early 16th cent.: from Latin, from Greek ephēmeros 'lasting only a day'