If Gb2-25 marks the end of the dark period before the evening star will rise, then we ought to look 263 glyphs beyond in order to find the next dark period, the 8 nights between the evening and morning star appearances of Venus:

glyph numbers are counted from Gb8-30 (and Gb8-30 is counted twice between Gb6-25 and Ga3-11)
	86		38			134
Gb2-25		Gb5-14 (368)		Gb6-24	Gb6-25 (408)		Ga3-11
	126				136
	262

262 is close to 263, and odd numbers are unlucky and should be avoided. Let us now inspect the surroundings of Ga3-11:

glyph numbers are counted beyond Gb2-25
3
	Ga3-10	Ga3-11	Ga3-12	Ga3-13	Ga3-14	Ga3-15	Ga3-16
	261	262	263	264	265	266	267
4				Haú at Ga3-14 (cfr 314) is glyph number 265 beyond haú at Gb2-25. 265 = 5 * 53, and 53 presumably functions as a symbol of the dark (e.g. beyond 52 * 7 = 364 days).
	Ga3-17	Ga3-18	Ga3-19
	268	269	270
5			The contrast between tagata with a vero head in Ga3-10 and tagata with a ragi head in Ga3-20 is significant. 270 = 584 - 314
	Ga3-20	Ga3-21
	1	2

From the glyphs it seems to be rather clear that there are 260 days to be counted between haú at Gb2-25 and the dark glyph Ga3-10 (where 261 = 9 * 29). We ought to redraw the picture:

	86		38			132
Gb2-25		Gb5-14 (368)		Gb6-24	Gb6-25 (408)		Ga3-9
	126				134
	260

260 (instead of 263) + 10 (instead of 8) = 270. Ignoring the 40 days from Gb5-14 to Gb6-25, we can count 86 + 134 = 220.

A possible summary of the Venus phases on Easter Island: