About: Yerm Lunar Calendar   Sponge Permalink

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The Yerm Lunar Calendar is a simple pure lunar calendar invented by Karl Palmen in 1998. The months are grouped into yerms, so that every odd-numbered month of the yerm has 30 nights and every even-numbered month of the yerm has 29 nights without exception. Having a 3-yerm cycle where two yerms have 17 months and one yerm has 15 months would produce a fairly accurate mean month of 29.530612 days. This is called the Basic Yerm Calendar. This 3-yerm cycle has 49 months and is exactly 14 days short of four years including one leap day.

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  • Yerm Lunar Calendar
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  • The Yerm Lunar Calendar is a simple pure lunar calendar invented by Karl Palmen in 1998. The months are grouped into yerms, so that every odd-numbered month of the yerm has 30 nights and every even-numbered month of the yerm has 29 nights without exception. Having a 3-yerm cycle where two yerms have 17 months and one yerm has 15 months would produce a fairly accurate mean month of 29.530612 days. This is called the Basic Yerm Calendar. This 3-yerm cycle has 49 months and is exactly 14 days short of four years including one leap day.
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abstract
  • The Yerm Lunar Calendar is a simple pure lunar calendar invented by Karl Palmen in 1998. The months are grouped into yerms, so that every odd-numbered month of the yerm has 30 nights and every even-numbered month of the yerm has 29 nights without exception. Having a 3-yerm cycle where two yerms have 17 months and one yerm has 15 months would produce a fairly accurate mean month of 29.530612 days. This is called the Basic Yerm Calendar. This 3-yerm cycle has 49 months and is exactly 14 days short of four years including one leap day. The Basic Yerm Calendar can be made more accurate by occasionally inserting an additional 17-month yerm. In the Yerm calendar this is done once every 17 three-yerm cycles to produce a 52-yerm cycle of 850 months and of 25101 days. This provides a mean month of 29.530588235... days.
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