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Ptolemy's Almagest

Type Event Region Egypt Time c. 150

Around the mid-2nd century CE, the Greek astronomer Ptolemy completed the Almagest in Alexandria, Egypt, systematically summarizing and advancing anc…

Timeline

  1. c. 127–151Alexandria · EgyptPtolemy conducted long-term astronomical observations in Alexandria, compiled the achievements of his predecessors, and developed the epicycle-deferent model and trigonometric calculation methods, laying the theoretical and data foundation for writing the Almagest.
  2. c. 150Alexandria · EgyptPtolemy completed the thirteen-book Almagest, written in Greek under the original title Mathematical Compilation, later known as the Almagest, becoming the most authoritative systematic work of classical astronomy.

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