Ptolemy's Almagest
Claudius Ptolemy, trans. G. J. Toomer. . London: Duckworth, 1984. Composed c. 150 CE.
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Reissued by Princeton University Press, 1998. Book VII chapters 2-3 for precession.
Cited by
What it is cited for
Where an entry recorded why it leaned on this work, the reason is repeated here. A source cited well outside its own scope is visible in this list before it is visible anywhere else.
- Aquarius
- Hipparchus's report of precession, the mechanism the "Age of Aquarius" question depends on.
- Cancer
- Hipparchus on precession, for why the June solstice point no longer lies within the constellation Cancer.
- Claudius Ptolemy
- For the treatment of precession, and only for that: it is the one locus in the Almagest this site has checked. The precession argument itself belongs to that entry and is not restated here.
- Precession of the Equinoxes
- The report of Hipparchus's comparison of stellar longitudes and his conclusion that the rate is not less than one degree per century.
- Three Reference Frames
- The report of Hipparchus on precession.