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AT-1218

Ptolemy's Almagest

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AT-1218
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AT-1218
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Recorded research uses

AT-1218

Precession of the Equinoxes

Why Ancient Inquiry uses this citation here

Edition-identifiable translation of the principal surviving ancient technical witness for Hipparchus's precession result and Ptolemy's own treatment; public copy should cite book, chapter, and edition pages.

What this usage does not establish

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Topics citing it and claims using it

Topic citing this source

Precession of the Equinoxes

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Supporting citation for public claim

Hipparchus is the earliest widely credited discoverer of precession in the Greek tradition, known chiefly through Ptolemy's later account.

Precession is one of the most important real astronomical concepts in the ancient astronomy cluster. The physical effect is established, and the Greek source trail through Hipparchus and Ptolemy is the clearest early technical evidence.
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Supporting citation for public claim

The surviving Greek source tradition attributes Hipparchus's result to comparison of stellar positions with earlier observations.

Precession is one of the most important real astronomical concepts in the ancient astronomy cluster. The physical effect is established, and the Greek source trail through Hipparchus and Ptolemy is the clearest early technical evidence.
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Supporting citation for public claim

Ptolemy's Almagest preserves and systematizes the ancient Greek discussion of precession.

Precession is one of the most important real astronomical concepts in the ancient astronomy cluster. The physical effect is established, and the Greek source trail through Hipparchus and Ptolemy is the clearest early technical evidence.
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Supporting citation for public claim

Hipparchus remains the earliest widely credited Greek discoverer, although the account depends substantially on later testimony.

Answer / theory: He is the earliest widely credited Greek discoverer. What supports it: Ptolemy's later report and the Greek astronomical source tradition. What is weak or disputed: Hipparchus' own writings are mostly lost. Evidence level: Strong Evidence with source limits.
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Limiting / critical citation for public claim

The claim that precession was known worldwide in deep antiquity and encoded in myths and monuments before Hipparchus is unsupported by the catalog.

The evidence does not automatically support broader causal, technological, transmission, or literalizing claims beyond the cited record.
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