I can see there were first 5 nights from the December solstice followed by another 4, and among these 9 nights was Christmas Eve a special night (kua vero) seen ideally close to the Full Moon in June 26 (6 synodic lunar months from January 1).

This was where the Bow of the Archer was close to the Full Moon and when the weak stars of the Unicorn were together with the Sun, and when the harvest had been put into the Winnowing Basket:

SAGITTARIUS:
20	Purva Ashadha	δ and ε Sagittarii	Elephant tusk, fan, winnowing basket	278 = 260 + 18
	first of the ashādhā (the invincible one, the name of a constellation)	Kaus		Dec 24 (358)

1	Horn	α Virginis (Spica)	Crocodile	(202.7)	Oct 10 (283)	283 = 265 + 18
2	Neck	κ Virginis	Dragon	(214.8)	Oct 22 (295)	295 = 283 + 12
3	Root	α Librae (Zuben Elgenubi)	Badger	(224.2)	Oct 31 (304)	304 = 295 + 9
4	Room	π Scorpii (Vrischika)	Hare	(241.3)	Nov 17 (321)	321 = 304 + 17
5	Heart	σ Scorpii	Fox	(247.0)	Nov 23 (327)	327 = 321 + 6
6	Tail	μ Scorpii (Denebakrab)	Tiger	(254.7)	Dec 1 (335)	335 = 327 + 8
7	Winnowing Basket	γ Sagittarii (Nash)	Leopard	(273.7)	Dec 20 (354)	354 = 335 + 19
December solstice
8	South Dipper	φ Sagittarii (?)	Unicorn	(284.0)	Dec 30 (364)	364 = 354 + 10

St John's Eve	St John's day	June 25	26 (177)	27
Cb10-19	Cb10-20	Cb10-21	Cb10-22	Cb11-1 (645)
te hokohuki - manu rere	te kihikihi o te marama	te maro o te henua	kua vero	Te kihikihi - tagata moe
κ Aurigae (93.6), κ Columbae (93.8)	Furud (94.9), δ Columbae (95.2), TEJAT POSTERIOR, Mirzam (95.4)	Canopus (95.6), ε Monocerotis (95.7), ψ1 Aurigae (95.9)	β Monocerotis (97.0)	no star listed
solstice	22	23	X-mas Eve (358)	X-mas Day
π Pavonis (274.6), ι Pavonis (275.1)	Polis (275.9)	η Sagittarii (276.9), KAUS MEDIUS, κ Lyrae (277.5)	Tung Hae (277.7), KAUS AUSTRALIS (278.3), ξ Pavonis (278.4)	Al Athfar (278.6), Kaus Borealis (279.3)
Menkar 720

The Chinese system had the Winnowing Basket ruled by Nash (γ Sagittarii) while in the Hindu system it was ruled by the pair δ and ε (Kaus Medius respectively Kaus Australis).

June 28	29	30 (181)	July 1
Cb11-2 (646)	Cb11-3	Cb11-4	Cb11-5
ki te ariki - te hokohuki	ko te inoino - te henua	te inoino - te henua	te henua
December 26 (360)	27	28	29

July 2	3 (184)
Cb11-6 (650)	Cb11-7
Tagata hua hakahitihiti	koia kua tu
December 30 (364)	31

Anyhow, the task was to separate the grain from the chaff by using a basket (fan):

"Wind winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It is also used to remove weevils or other pests from stored grain. Threshing, the loosening of grain or seeds from the husks and straw, is the step in the chaff-removal process that comes before winnowing.

In its simplest form it involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery. Techniques included using a winnowing fan (a shaped basket shaken to raise the chaff) or using a tool (a winnowing fork or shovel) on a pile of harvested grain." (Wikipedia)

"... in the worship of China the three [γ, δ, and ε Sagittarii] were Feng Shï, the General of Wind." (Allen)

The wind had to blow and at Cb10-15 Metoro mentioned te matagi (the wind):