Definition of "ephemeris"
noun
plural ephemerides or ephemerises
(astronomy, nautical) A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination.
Quotations
[…] Mr. Samuel got 150 pounds of bread, with a small quantity of rum and wine, also a quadrant and compass; but he was forbidden on pain of death to touch either map, ephemeris, book of astronomical observations, sextant, timekeeper, or any of my surveys or drawings.
1792, William Bligh, chapter 13, in A Voyage to the South Sea