1An influential treatise on astronomy written by the Greek astronomer and geographer Ptolemy in the second century ad.
- Finally, the translation of Ptolemy's Almagest furnished important astronomical material.
- But once they had translated Ptolemy's Almagest, they developed astronomy so quickly that their mark is found at every step.
- Menelaus's work formed the basis for Ptolemy's numerical solutions of spherical astronomy problems in the Almagest.
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