ephemeris Hear it!

ephemeris definition

ephem·eris (e fem′ər is, i-)

noun pl. ephemerides eph′·emer′i·des′ (ef′ə mer′ə dēz′)

  1. a table giving the computed positions of a celestial body for every day of a given period
  2. an astronomical almanac containing such tables
  3. Obsolete a calendar or diary

Etymology: L < Gr ephēmeris, diary, calendar < ephēmeros: see ephemeron

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.