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Xor Rotation Group

P Xn =  Waxing and Waning of the Seasons

Winter Solstice - the height of yin energy. 21 Dec 2014 22 Dec 2015
New Year's Day - the first return of yang. 19 Jan 2015 20 Jan 2016
Thickening Spring - yang strengthens, becoming palpable. 18 Feb 19 Feb
Spring Equinox - yin and yang are balanced, and yang is rising. 20 Mar 20 Mar
Vigorous Growth - yang energy now dominates. 20 Apr 19 Apr
Breakthrough - the last yin is about to yield. 21 May 20 May
Summer Solstice - the height of yang energy. 21 Jun 20 Jun
The Year Turns - the peak of summer is past and the touch of yin returns. 22 Jul 21 Jul
Summer Withdraws - yin encroaches further. 22 Aug 21 Aug
Autumn Equinox - yin and yang balanced, but yin is rising. 23 Sep 22 Sep
Winter's Approach - yin now dominates the season. 23 Oct 22 Oct
Old Year's Day - the last yang is about to split away. 22 Nov 21 Nov

For a more detailed description of the interpretation of this xor rotation group in terms of the calendar, see the PDF note here.

These dates are for the Northern hemisphere. If you want to calculate the dates for yourself, here's a spreadsheet. There are a number fo good sources for the raw data, including Wikipedia.

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