Learn how to say Ephemeris correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word ephemeris:
Word forms: plural ephemerides (ˌɛfɪˈmɛrɪˌdiːz Pronunciation for )
a table giving the future positions of a planet, comet, or satellite
an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
(obsolete) a diary or almanac