3. Counting from Rogo in Gb6-26 is necessary - according to my model - in order to reach the current position for the heliacal rising of Sirius at Ga2-7:

63 36
Gb6-25 (408) Gb6-26 (*1)
Ga2-1 (*96) Ga2-2 Ga2-3 Ga2-4 Ga2-5 (*100)
Canopus (96.6)     ν Puppis (100.2)
The Rudder
Ga2-6 Ga2-7 (*102) Ga2-8

Tagata in Ga2-7 stands at a 'mirror' we can see from how the hands are - seemingly (they are different) - reversed. The hand at left is a left hand and the hand at right a right hand.

510.2 (the position of Sirius) - 472 = 38.2 (just a fraction more than 38.1 = 381 / 10), and on the front side (counting from Gb8-30) glyph number 38 is Ga2-7.

By instead counting from Rogo in Gb6-26 its position will be (64 + 36) + 2 = 102, and 06h 43m / 1440m * 365.25 = 102.2. This number may seem meaningless (and therefore wrong), but if we add 90 it becomes 192.

Glyph number 408 is Gb6-25 and maybe we should count 6 times 25, because then the result will be 150 or half 10 * 30.

We remember that 6 was the probable number value for a spoke in a 32-spoked wheel of time, 6 * 32 = 192. A chariot with 2 horses and 2 wheels can be seen as a model for the year. Each wheel corresponds to '22'.

If the wheel has 6 spokes, then the number value should be 30, implying a year with 360 regular days. If the number value was 25, then the year should be 300 days.

Every operation has its inverse and by contemplating which glyph could give the result 408 by an act of multiplication we can reach e.g. Gb5-18:

Gb5-10 (364) Gb5-11 Gb5-12 Gb5-13
Gb5-14 (*432) Gb5-15 Gb5-16 Gb5-17 Gb5-18 (*436) Gb5-19 Gb5-20