ephemeris

noun

1. (obsolete)A journal or diary.

   “Wee heard the King was solacing at the Caspian Sea, whither now wee are travelling. Till then let us keepe an Ephemerides or day-journey.”

2. A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination.

   “[…]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.”

3. Computer software that calculates the apparent position of celestial bodies.