Editing Hypatia (section)

===Edition of the ''Almagest''===
[[File:Ptolemaicsystem-small.png|thumb|upright=1.1|Hypatia is known to have edited at least Book III of [[Ptolemy]]'s ''[[Almagest]]'',{{sfn|Dzielska|1996|pages=71–2}}{{sfn|Cameron|2016|pages=193–194}}{{sfn|Booth|2017|pages=108–111}} which supported the [[geocentric model]] of the universe shown in this diagram.{{sfn|Emmer|2012|page=76}}{{sfn|Cameron|2016|pages=193–194}}]]

Hypatia is now known to have edited the existing text of Book III of [[Ptolemy]]'s ''[[Almagest]]''.{{sfn|Dzielska|1996|pages=71–2}}{{sfn|Cameron|2016|pages=193–194}}{{sfn|Booth|2017|pages=108–111}} It was once thought that Hypatia had merely revised Theon's commentary on the ''Almagest'',{{sfn|Dzielska|1996|pages=71–72}} based on the title of Theon's commentary on the third book of ''Almagest'', which reads "Commentary by Theon of Alexandria on Book III of Ptolemy's ''Almagest'', edition revised by my daughter Hypatia, the philosopher",{{sfn|Dzielska|1996|pages=71–72}}{{sfn|Cameron|Long|Sherry|1993|page=45}} but, based on analysis of the titles of Theon's other commentaries and similar titles from the time period, scholars have concluded that Hypatia corrected, not her father's commentary, but the text of ''Almagest'' itself.{{sfn|Dzielska|1996|pages=71–72}}{{sfn|Cameron|Long|Sherry|1993|pages=45–47}} Her contribution is thought to be an improved method for the [[long division]] algorithms needed for astronomical computation. The [[Geocentric model#Ptolemaic system|Ptolemaic model]] of the universe was [[Geocentric model|geocentric]], meaning it taught that the Sun revolved around the Earth. In the ''Almagest'', Ptolemy proposed a division problem for calculating the number of degrees swept out by the Sun in a single day as it orbits the Earth. In his early commentary, Theon had tried to improve upon Ptolemy's division calculation. In the text edited by Hypatia, a tabular method is detailed.{{sfn|Emmer|2012|page=76}} This tabular method might be the "astronomical table" which historic sources attribute to Hypatia.{{sfn|Emmer|2012|page=76}} Classicist [[Alan Cameron (classical scholar)|Alan Cameron]] additionally states that it is possible Hypatia may have edited, not only Book III, but all nine extant books of the ''Almagest''.{{sfn|Cameron|2016|pages=193–194}}