Spring sun represents fire and when water arrives he therefore must 'die'. In Q it is possible to read where this 'water' is located in the calendar:

2 34 2 4 133
Qa8-47 (342) Qa9-3 Qa9-38 Qa9-41 *Qb3-37 (521)
180 glyphs = 90 days
214 54
*Qb3-38 (522) *Qa2-32
270 glyphs = 135 days

These are all the vai glyphs in Q:

*Qa2-32 *Qa4-23 Qa8-47 Qa9-3 Qa9-38 Qa9-41 *Qb3-38

A sharp eye will find a vertical straight line of measurement at right in *Qa2-32 (and also a dot for drawing attention). The season of vai apparently is ending there.

It seems to begin with the curious Qa8-47, drawn like an uplifted fruit (Hua Reva), and after a quarter there will be a break because the season of nuku arrives (at which point a reader of the parallel H text has to turn that tablet around and continue to read on its side b).

90 + 135 = 225 = 15 * 15, that - I suggest - is the duration of the season of vai. The season of spring sun will then be 368 - 225 = 143 days long:

74 211
*Qa4-23 (130)
286 glyphs = 143 days

One day seems to be missing in the Q text, because sun ought to have 12 * 12 = 144 days. Maybe we have to read the last day of the calendar twice (as when we are reading G):

*Qb5-33 *Qb5-34 (608) *Qb5-35 *Qb5-36
368 = 608 / 2 + 64 369 = day 1

369 can be understood as 36 (sun) and 9 ('death'). However, the numbers in *Qb5-36 suggest 5 * 36 = 180 days, which should make us turn our attention from winter solstice to high summer:

Qa8-46 Qa8-47 Qa9-1 Qa9-2 (344)
342 / 2 + 64 = 235 236
Qa9-3 Qa9-4
237

Presumably the Hua Reva sign in Qa8-47 should be understood to mean that we are still in the season of the sun. But the preceding autumn vaha mea shark is announcing that next season is opening up.

Day 236 is where we find Te Pei (= 8 * 29.5) and 237 is the first day of the next part of the calendar. Vai has arrived (Qa9-3) and the head is gone (cfr the left figure in Qa9-4). The head was first transformed into a 'fruit' formed after vai, then it lifted and went off (Qa8-47). The vai season is in the text suggested to be the natural consequence of sun's Hua Reva.

Day 236 has sun at left and moon at right. The sun flames are drawn with a downward, not quite horizontal, line across the middle. A new glyph line is beginning.