According to the end-of-period glyphs in the E calendar there are 24 periods:
Naturally we have interpreted these 24 periods as covering half a month, with 6 periods for each quarter, beginning at midwinter. The 'knees' of the 'person' are extra pronounced in periods 5 and 17-18 to indicate the equinoxes. The 'persons' in periods 7 and 12 (which define the 2nd quarter) have 'uplifted legs' to illustrate how the sky roof (the body and limbs of the 'person') is lifted up to let in much light during the glorious spring period:
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