The many calendars make use of one ore more of the following astronomical cycles:

Year Cycles[edit | edit source]

Month Cycles[edit | edit source]

Other Cycles[edit | edit source]

  • Metonic cycle: 19 years approximated to 235 synodic months, sometimes approximated to 6940 days.
  • Full moon cycle Cycle of apparent size and age of full moon lasting just under 14 synodic months
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