Uploaded February 2019 | Updated September 2026, 2 hours ago

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This is just simple basics on how to calculate the progress of moon phases, no orbital mechanics is included and so it's not dead accurate on some aspects.

Spreadsheet
drive.google.com/open?id=1qqPzjGXAdBukg8dnxSCvPVW4p2_Wg2q8BxHEJWVq678