First we should compare the different periods:

1b 2b 3b 4b 5b 6b
10 9 10 10 10 9
19 29
10 + 19 + 29 = 58

The numbers are what I arrive at when counting the 'feather' markings.

The 'toes in front' in 1b could be imagined as 3 'extra feathers', needed to increase 58 to 61 → 366 / 6.

... In China, every year about the beginning of April, certain officials called Sz'hüen used of old to go about the country armed with wooden clappers. Their business was to summon the people and command them to put out every fire. This was the beginning of the season called Han-shih-tsieh, or 'eating of cold food'. For three days all household fires remained extinct as a preparation for the solemn renewal of the fire, which took place on the fifth or sixth day after the winter solstice ...

Disregarding the 'feathers', we can see that 2b = 3b and 4b = 6b, with both pairs adding up to 19. 58 - 2 * 19 = 20 → 400 / 20.

All 1 + 2 + 3 glyphs are variants of GD19.

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