ephemeris
Concise Oxford English Dictionary © 2008 Oxford University Press:
ephemeris /ɪˈfɛm(ə)rɪs, -ˈfiːm-/
▶noun (pl. ephemerides /ˌɛfɪˈmɛrɪdiːz/) Astronomy & Astrology a table of the calculated positions of a celestial object at regular intervals throughout a period.
– origin C16: from L., from Gk ephēmeros ‘lasting only a day’.
'ephemeris' also found in these Oxford entries:

