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Octant Calendar

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The Octant Calendar is an astronomic calendar design by Walter Ziobro. I divides the seasonal year into 8 periods, called octants.

The design was first published on 24 August 2013 on the public CALNDR-L mailing list.

This calendar may be useful, when and where one wants to …

  1. divide the year into eighths, because it’s convenient or appropriate.
  2. use base eight units.
  3. divide the the year at seasonal points without choosing either the cardinal seasonal points or the midpoints between them.

It resembles the Celtic wheel of the year. The octants start on the astronomical date of all cardinal and mid points of the four seasons, like eight of the solar terms of the Chinese calendar do. This results in 43 to 48 days per octant. Latin names represent both the astronomic point and the octant that it starts.

Octants (months)
Latin Name Approximate Gregorian Start Solar Longitude Northern Celtic Chinese Term Approximate Length
Equinoctium australe Sep 22 180° Mabon Qiufen 47 d
Incrementum australe Nov 08 225° Samhain Lidong 43 d
Solsticium australe Dec 21 270° Yule Dongzhi 46 d
Decrementum australe Feb 5 315° Imbolc Lichun 43 d
Equinoctium boreale Mar 20 Ostara Chunfen 47 d
Incrementum boreale May 6 45° Beltane Lixia 46 d
Solsticium boreale Jun 21 90° Midsummer Xiazhi 48 d
Decrementum boreale Aug 8 135° Lammas Liqiu 45 d

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