4. But hold on! Once again we have been lead astray in the labyrinth of time, because spring equinox (September 16) should not arrive until with the heliacal rising of Denebola (and 93 Leonis):

12th hour:
Ga4-20 (104) Ga4-21 Ga4-22 (*170) Ga4-23 Ga4-24 (108)
Dubhe (167.7)    Al Sharas (169.7), Zosma (170.2), Coxa (170.4)   Alula (171.5), Labrum (171.6)
11. Purva Phalguni
Ga4-25 Ga4-26 Ga4-27 Ga5-1 (112) Ga5-2 (*177)
Ga5-3 Ga5-4 (**87) Ga5-5 (*180)
  93 Leonis (179.0), Denebola (179.3) Alaraph (179.6), Phekda (180.3)
12. Uttara Phalguni
spring equinox (179 - 92 = 87)
Ga5-6 Ga5-7

Counting from the beginning of anwaa Suhail at August 30 is not the same thing as counting from the heliacal rising of Alterf. This star is rising heliacally 144 days beyond spring equinox north of the equator, which means 144 - 92 = 52 days beyond winter solstice south of the equator:

South of the equator North of the equator
autumn equinox 266 89 = 266 - 177 spring equinox 80 (89)
Achird 266 + 11.7 = 277.7 92 = 358 - 266 Achird 89 + 11.7 = 100.7
winter solstice 358 = 266 +172 - 80 summer solstice 172 (181)
Sun returns (Naos) 23 (*122) = 87 - 64 87 Sun leaves (Naos) 202 (211)
Alterf 52 Alterf 240 = 211 + 29
Achir (Regulus) 266 + 153.7 - 358 = 61.7 Achir (Regulus) 89 + 153.7 = 242.7
Alkes 75 = 266 + 167 - 358 Alkes 256 = 89 + 167
spring equinox (Denebola) 87 = 358 + (266 - 172) - 365 autumn equinox (Denebola) 266 (275)
summer solstice 177 = 87 + (356 - 266) 90 = 177 - 87 winter solstice 356 (365)
Sun leaves (Altair) 202 (*301) = 23 + 179   Sun returns (Altair) 16 (25)

Thus Alterf arrives 87 - 52 = 35 days before Denebola and spring equinox. 115 (the glyph number at Denebola) - 80 (the glyph number at Alterf) = 35.

If Denebola is at September 16, then Alterf must be at August 12, i.e. 31 - (35 - 16) = 12, or 18 days earlier than the stated beginning of anwaa Suhail at August 30.

18 days happens to be the same length of time as that between Ashlesha and Magha, one of the 'fallow' periods which I have coined Moe:

Ga3-7 Ga3-8 (68) Ga3-9 Ga3-10 (**42)
Al Minhar al Shujā, Museida (130.9), Beehive (131.4) Ascellus Borealis (131.9), Ascellus Australis (132.4) ε Hydrae (132.9) ρ Hydrae (133.4)
9. Ashlesha
18
Ga4-5 (*153) Ga4-6 (90)
Al Jabhah (153.4) Regulus (153.7)
Moe 10. Magha

Perhaps the Arabic anwaa system is halting.

The end of anwaa Suhail is stated to coincide with day 157 counted from May 17 (137), i.e. with October 21 (294):

Nawaa Manzil Begins on Number of days Stars
Al Jawzaa Heka 9 July (190) 13 66 Heka
Alhena 22 July (203) 13 79 Alhena
Murzim Murzim 4 Aug (216) 13 92 Canis Major
Kulaibain An Nathra 17 Aug (229) 13 105 An Nathra
Suhail Alterf 30 Aug (242) 13 118 Alterf
Dschuba 12 Sept (255) 13 131 Dschuba
Azzubra 25 Sept (268) 13 144  
Assarfa 8 Oct (281) 13 157  

294 - 137 = 157 = 314 / 2.

In the G text there is a vero in Ga5-17 (which can be alluding to May 17):

Ga5-17 (*192) Ga5-18 Ga5-19 Ga5-20 Ga5-21 (132)

The Marquesan month veo was the 10th in the lunar year. Vero in Ga5-17 is located 100 days beyond winter solstice (south of the equator).