About: Astronomic Soli-Lunar Calendar   Sponge Permalink

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The Astronomic Soli-Lunar Calendar or Astronomical Blue Moon Calendar was developped by Walter Ziobro, who posted a description to the CALNDR-L mailing list on 22 August 2013. Karl Palmen suggested alternative month names early / mid / blue / late per quarter. This lunisolar calendar is based on the seasonal blue-moon rule: If four full moons occur between two seasonal points (equinoxes and solstices), the third is a seasonal blue moon. It becomes the leap month here. Months start with the new moon per UT, therefore their lengths are variable.

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  • Astronomic Soli-Lunar Calendar
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  • The Astronomic Soli-Lunar Calendar or Astronomical Blue Moon Calendar was developped by Walter Ziobro, who posted a description to the CALNDR-L mailing list on 22 August 2013. Karl Palmen suggested alternative month names early / mid / blue / late per quarter. This lunisolar calendar is based on the seasonal blue-moon rule: If four full moons occur between two seasonal points (equinoxes and solstices), the third is a seasonal blue moon. It becomes the leap month here. Months start with the new moon per UT, therefore their lengths are variable.
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  • The Astronomic Soli-Lunar Calendar or Astronomical Blue Moon Calendar was developped by Walter Ziobro, who posted a description to the CALNDR-L mailing list on 22 August 2013. Karl Palmen suggested alternative month names early / mid / blue / late per quarter. This lunisolar calendar is based on the seasonal blue-moon rule: If four full moons occur between two seasonal points (equinoxes and solstices), the third is a seasonal blue moon. It becomes the leap month here. The year is divided into a notos half, where the full moon will occur south of the celestial equator, and a arctos half, when it will appear north. Months within these halves are labeled by Greek letter names sequentially, but leap months use ancient letters Qoppa and Digamma respectively. Months start with the new moon per UT, therefore their lengths are variable. In the 19 year period between 2014-03-31 and 2033-03-30, there will be seven leap months: Notos Koppa 2016-05-07 2019-05-04 2027-05-06 Notos Digamma 2021-08-08 2024-08-05 2032-08-06 Arctos Koppa 2029-11-06 Arctos Digamma none This uneven distribution exemplifies that northern spring and summer are longer than the southern ones, i.e. northern fall/autumn and winter, currently.
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