Hexagram Navigator

Xor Rotation Group

P _X> n =  Waxing and Waning of the Seasons

				2011-12		2012-13
		Winter Solstice - the height of yin energy.		22 Dec 2011		21 Dec 2012
		New Year's Day - the first return of yang.		20 Jan 2012		20 Jan 2013
		Thickening Spring - yang strengthens, becoming palpable.		19 Feb		18 Feb
		Spring Equinox - yin and yang are balanced, and yang is rising.		20 Mar		20 Mar
		Vigorous Growth - yang energy now dominates.		19 Apr		20 Apr
		Breakthrough - the last yin is about to yield.		20 May		21 May
		Summer Solstice - the height of yang energy.		20 Jun		21 Jun
		The Year Turns - the peak of summer is past and the touch of yin returns.		21 Jul		22 Jul
		Summer Withdraws - yin encroaches further.		21 Aug		22 Aug
		Autumn Equinox - yin and yang balanced, but yin is rising.		22 Sep		22 Sep
		Winter's Approach - yin now dominates the season.		22 Oct		22 Oct
		Old Year's Day - the last yang is about to split away.		21 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.