We leave the night calendar of Tahua in order to take a quick look at the other end of the day, the daylight calendar:

Aa1-16	Aa1-17	Aa1-18	Aa1-19	Aa1-20	Aa1-21
Aa1-22	Aa1-23	Aa1-24	Aa1-25	Aa1-26	Aa1-27
Aa1-28	Aa1-29	Aa1-30	Aa1-31	Aa1-32	Aa1-33
Aa1-34	Aa1-35	Aa1-36

The Y sign appears thrice, all the time at the top of the glyphs. No Y sign can be found during the first half of the day. The suggestion of Y meaning the 'season of straw' is here receiving support, because beyond midsummer (and therefore also beyond noon) growth abates.

The Y-sign seems to have indicated the season beyond midsummer also in The Gateway of the Sun at Tiahuanaco.