In the 'calendar of daylight', according to A, we find a.m. sun described as growing by way of a gesture with 'hand' inwards:

period 1
	Aa1-18	Aa1-19
period 2
	Aa1-20	Aa1-21
period 3
	Aa1-22	Aa1-23
period 4
	Aa1-24	Aa1-25

The hand gesture means 'eating', necessary for growing.