Editing Almagest (section)

{{Short description|Astronomical treatise by Claudius Ptolemy}}
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[[File:Claudius Ptolemaeus, Almagestum, 1515.djvu|page=309|thumb|An edition in Latin of the ''Almagestum'' in 1515]]

The '''''Almagest''''' ({{IPAc-en|ˈ|æ|l|m|ə|dʒ|ɛ|s|t}} {{respell|AL|mə|jest}}) is a 2nd-century [[Greek mathematics|mathematical]] and [[Greek astronomy|astronomical]] treatise on the apparent motions of the [[star]]s and [[planet]]ary paths, written by [[Ptolemy|Claudius Ptolemy]] ({{nowrap|{{circa}} AD 100 –}} {{circa|lk=no|170}}) in [[Koine Greek]].{{sfn|Tomarchio|2022|p=xv}} One of the most influential scientific texts in history, it canonized a [[geocentric model]] of the [[Universe]] that was accepted for more than 1,200 years from its origin in Hellenistic [[Roman-era Alexandria|Alexandria]], in the medieval [[Byzantine]] and [[Islamic Golden Age|Islamic]] worlds, and in Western Europe through the [[Middle Ages]] and early [[Renaissance]] until [[Copernicus]]. It is also a key source of information about ancient [[Greek astronomy]].

Ptolemy set up a public inscription at [[Canopus, Egypt]], in 147 or 148. Norman T. Hamilton found that the version of Ptolemy's models set out in the ''Canopic Inscription'' was earlier than the version in the ''Almagest''. Hence the ''Almagest'' could not have been completed before about 150, a quarter-century after Ptolemy began observing.{{sfn|Hamilton|Swerdlow|1987|p={{Pages needed |date=April 2019}}}}{{sfn|Kunitzsch|2008|pp=140–141}}

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