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World 5 · The Antikythera Computer · 11 min · PRO

Gear trains and ratios

How teeth set the speed

PRO · Ancient Engineering

World 5: The Antikythera Computer is part of PRO

The first world of Ancient Engineering is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • A lump of bronze from a shipwreck
  • Cycles of the sky: Metonic and Saros
  • The Moon's uneven pace, and what is still unknown
  • Building a stone circle
  • The Sun's path and the solstice azimuth
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