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I'm reading about Antikythera machine and its functions. So I read about solar cycle and moon cycle and how they used 19 solar years to compare with 235 lunar cycles.

So this is my question: They know about leap day at the time (~ 200 BC)?

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  • $\begingroup$ I'm voting to close this question as off-topic because This might be better suited to HSM.SE (history of science) $\endgroup$ – Carl Witthoft May 21 '18 at 15:34
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    $\begingroup$ @CarlWitthoft If a question is ontopic on multiple sites, the relevant SE ruling is that it remains where it is opened. $\endgroup$ – peterh May 21 '18 at 16:21
  • $\begingroup$ This is more about ancient calendar trivia than it is about the history of astronomy. $\endgroup$ – called2voyage May 21 '18 at 17:50
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Well, they know according to the Metonic Calendar created in ~430 B.C.

To know more about click here.

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