luminary, the Moon.

Based on Ptolemy's discussion in the Almagest, values for the equation of time (Arabic ta?dil al-ayyam bi layalayha) were standard for the tables (zij) in the works of medieval Islamic astronomy.Reprinted in:

Early modern period

A description of apparent and mean time was given by Nevil Maskelyne in the Nautical Almanac for 1767: "Apparent Time is that deduced immediately

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