ephemeris

noun ephem·er·is \-mə-rəs\

plural eph·e·mer·i·des \ˌe-fə-ˈmer-ə-ˌdēz\

Definition of EPHEMERIS

: a tabular statement of the assigned places of a celestial body for regular intervals

Latin, diary, ephemeris, from Greek ephēmeris, from ephēmeros

First Known Use: 1508

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