Canopus	α Carinae	−0.72	52° 40′ S	06h 21m	96.6	504.6
	ψ1 Aurigae	4.92	49° 17′ N	06h 22m	96.9	504.9
	ν Puppis	3.17	43° 12′ S	06h 35m	100.2	508.1
	ψ3 Aurigae	5.34	39° 54′ N	06h 36m	100.4	508.4
	ψ2 Aurigae	4.80	42° 29′ N	06h 36m	100.5	508.5
	ψ4 Aurigae	5.04	44° 31′ N	06h 40m	101.5	509.5
Sirius	α Canis Majoris	-1.46	16° 39′ S	06h 43m	102.2	510.2
	ψ5 Aurigae	5.24	43° 35′ N	06h 44m	102.4	510.4
	ψ6 Aurigae	5.22	48° 47′ N	06h 45m	102.7	510.7
	τ Puppis	2.94	50° 37′ S	06h 47m	103.2	511.2
	ψ7 Aurigae	4.99	41° 47′ N	06h 48m	103.4	511.4
	ψ8 Aurigae	6.46	38° 30′ N	06h 51m	104.2	512.2
	ψ9 Aurigae	5.85	46° 16′ N	06h 54m	104.9	512.9


*Ga2-1 (96)**	Ga2-2	Ga2-3	Ga2-4
Canopus, ψ1


*Ga2-5 (100)**	Ga2-6	Ga2-7	Ga2-8
ν Puppis, ψ3, ψ2		ψ4, Sirius, ψ5	ψ6, τ Puppis, ψ7

Only 22 right ascension minutes separate them, and if the ancients believed in an ordered cosmos this could have made them conclude there was one cycle ('wheel') ending and another beginning in between, because 22 is approximately 7 * π.

The sign of the old cycle ending could have been the arrival of Canopus (a Saturn-day) and the sign of the new cycle could have been Sirius (at a day of Venus).

Perhaps the number of minutes at Sirius, 6 * 60 + 43 = 403, was in the mind of the creator of the text when he decided what glyph to assign to position 403:


*Gb6-17 (464)**	Gb6-18	Gb6-19


Gb6-20 (403)	Gb6-21	Gb6-22	Gb6-23	Gb6-24


Gb6-25	Gb6-26	Gb6-27	Gb6-28

If so, then we can guess there is a similar connection between Canopus and glyph number 6 * 60 + 21 = 381 (very close to the end of a cycle with 13 lunar months):


Gb5-10 (364)	Gb5-11	Gb5-12	Gb5-13


*Gb5-14 (432)**	Gb5-15	Gb5-16	Gb5-17	Gb5-18	Gb5-19	Gb5-20


Gb5-21	Gb5-22	Gb5-23	Gb5-24 (378)	Gb5-25


Gb5-26	Gb5-27 (381)	Gb5-28	Gb5-29


Gb6-1 (384)	Gb6-2	Gb6-3	Gb6-4

At tagata in Gb5-27 we can count 52 * 7 = 364. Hakaariki in Gb5-24 is glyph number 378, equal to the number of days in the synodical period of Saturn.

403 - 381 = 22.

I think the length of the synodical period of Saturn made it natural to think of this planet as indicating the end. The difference 13 * 29½ - 378 = 5½ is similar to 365¼ - 360 = 5¼.

Canopus is evidently like Saturn an indicator of a final and both have watery associations. Number 403 could indicate Sirius and be a symbol for the beginning of next season, rising like a new land from the waves. Perhaps the corresponding planet is Venus.