the.com/ephemeris
a table telling you exactly where a planet will be, as if the sky had a bus schedule.
means a published listing of the calculated positions of celestial objects at regular intervals over time.
from from greek ephemeris meaning diary or daily record, from epi- (upon) plus hemera (day) — astronomers borrowed the word for daily logs of the heavens, same root that gives us ephemeral.
first usersbabylonian astronomers tracked planetary positions on clay tablets
navigation toolsailors used ephemerides to calculate longitude at sea
modern formnasa publishes digital ephemerides for spacecraft navigation
root ironyshares roots with ephemeral, meaning fleeting or short-lived