the.com/ephemeris
a daily gossip column tracking where every planet was standing.
means a table listing the calculated positions of celestial objects for regular intervals of time.
from from greek ephemeros meaning lasting only a day, the same root as ephemeral, because these tables were originally daily entries plotting a wandering star's position across the sky.
pre-gps navigationsailors used ephemerides with sextants to find location at sea
astrology linkastrologers still use ephemerides to cast birth charts
plural formephemerides, not ephemerises, trips up even astronomers