If Te Pei is beginning with day 220, then day 16 could mark the end of growth and day 17 the beginning of waning:

Te Pei
Ga8-16 (0)	Ga8-17	Ga8-18	Ga8-19	Ga8-20
Ga8-21	Ga8-22	Ga8-23	Ga8-24	Ga8-25
Ga8-26	Gb1-1	Gb1-2	Gb1-3	Gb1-4
Gb1-5	Gb1-6 (16)	Gb1-7 (17)	Gb1-8	Gb1-9

Evidence is with us. Glyph number 220 is Ga8-16, where we now are able to read '8th month of the moon, the 16th night' (is in front).