Ephemeris
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In astronomy and celestial navigation, an ephemeris is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position
Alfonsine tables
Page from Almanach Perpetuum
Babylonian astronomy
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Babylonian astronomy was the study or recording of celestial objects during the early history of Mesopotamia. The numeral system used, sexagesimal, was based on 60, as opposed to ten in the modern dec
Ephemeris
…also used by astrologers. GPS signals include ephemeris data used to calculate the position of satellites in orbit. 1st millennium BC – Ephemerides in Babylonian astronomy. 2nd century AD – the Almagest and the Handy Tables of Ptolemy…
A Babylonian tablet recording Halley's Comet in 164 BC
Mul.apin cuneiform tablet