Editing Hipparchus (section)

=== Arguments for and against Hipparchus's star catalog in the Almagest ===

For:
* common errors in the reconstructed Hipparchian star catalogue and the Almagest suggest a direct transfer without re-observation within 265 years. There are 18 stars with common errors - for the other ~800 stars, the errors are not extant or within the error ellipse. That means, no further statement is allowed on these hundreds of stars. 
* further statistical arguments

Against:
* Unlike Ptolemy, Hipparchus did not use ecliptic coordinates to describe stellar positions. 
* Hipparchus's catalogue is reported in Roman times to have enlisted about 850 stars but Ptolemy's catalogue has 1025 stars. Thus, somebody has added further entries. 
* There are stars cited in the Almagest from Hipparchus that are missing in the Almagest star catalogue. Thus, by all the reworking within scientific progress in 265 years, not all of Hipparchus's stars made it into the Almagest version of the star catalogue.

Conclusion: Hipparchus's star catalogue is one of the sources of the Almagest star catalogue but not the only source.{{r|hoffmann2018}}