2. Of the stars in Crux only Acrux is listed with its position in my astronomy book. But we need also at least β, γ, and δ, at the arms of the cross. And I think also ε ('the little one') should be included.

I have earlier compared the viri type of glyph with ε, but the sizes are opposites, maybe due to winter being summer and vice versa. If so, then viri could belong in spring and epsilon in autumn.

All Crux stars are circumpolar and in principle in the 13th hour.

According to Wikipedia there are a few of the stars which not yet have reached 12h. The earliest of them is 1 Crucis at 11h 57m 40.04s (= day 182.0). None of the Crux stars is equally close to 13h.

Considering the effects of precession we could say the proper time for reading the sky should be around J2000 (the epoch of right ascension according to Wikipedia) + 72 * (365.25 / 2 - 182.0) = around the year 2050 A.D.

δ Crucis	12h 15m 08.76s	12h 15.146m	185.6
ε Crucis	12h 21m 21.81s	12h 21.364m	188.4
Acrux	12h 26m 35.94s	12h 26.599m	188.5
γ Crucis	12h 31m 09.93s	12h 31.166m	189.7
β Crucis	12h 47m 43.32s	12h 47.722m	193.9

13th hour:
Alchita	α Corvi	4.02	24° 27′ S	12h 06m	184.1	592.1
Minkar	ε Corvi	3.02	22° 20′ S	12h 08m	184.7	592.7
	δ Crucis	2.79	58° 45′ S	12h 12m	185.6	593.6
Megrez	δ Ursa Majoris	3.32	57° 19′ N	12h 13m	185.9	593.9
Gienah	γ Corvi	−0.94	22° 37′ S	12h 14m	186.1	594.1
Chang Sha	ζ Corvi	5.20	22° 13′ S	12h 18m	187.3	595.3
	ε Crucis	3.59	60° 24′ S	12h 23m	188.4	596.4
Acrux	α Crucis	1.40	62° 49′ S	12h 23m	188.5	596.5
Algorab	δ Corvi	2.94	16° 14′ S	12h 27m	189.5	597.5
Gacrux	γ Crucis	1.59	57° 07′ S	12h 28m	189.7	597.7
Avis Satyra	η Corvi	4.30	16° 12′ S	12h 30m	190.3	598.3
Asterion	β Canum Venaticorum	4.24	41° 38′ N	12h 31m	190.5	598.5
Kraz	β Corvi	2.65	23° 07′ S	12h 32m	190.7	598.7
Porrima	γ Virginis	2.74	01° 11′ S	12h 39m	192.5	600.5
Mimosa	β Crucis	1.25	59° 41′ S	12h 44m	193.9	601.9
Alioth	ε Ursa Majoris	1.76	56° 14′ N	12h 52m	195.8	603.8
Minelauva	δ Virginis	3.39	03° 40′ N	12h 53m	196.1	604.1
Cor Caroli	α Canum Venaticorum	2.89	38° 35′ N	12h 54m	196.3	604.3

The 5 main Crux stars as I have located them among the glyphs:

Ga5-11 (*186)	Ga5-12
23	24
δ Crucis (185.6), Gienah (186.1)	Chang Sha (187.3)

Ga5-13	Ga5-14	Ga5-15	Ga5-16 (**99)
25	26	27 (270)	28
ε Crucis (188.4)	Acrux (188.5)	Algorab (189.5), Gacrux (189.7), Avis Satyra (190.3)	Kraz (190.7)

Ga5-17 (*192)	Ga5-18	Ga5-19 (130)
September 29	30	October 1
		Mimosa (193.9)