April 17 (107)	18	19	20

Cb1-1 (393)	Cb1-2	Cb1-3	Cb1-4
E tupu - ki roto		o te hau tea	ki te henua - te maro
Al Sharatain-1 / Ashvini-1 / Bond-16	ι Arietis (28.0), λ Arietis (28.2)	Alrisha, χ Phoenicis (29.2)	2h (30.4)
Polaris, Baten Kaitos (26.6), Metallah (26.9), Segin, Mesarthim, ψ Phoenicis (27.2), SHERATAN, φ Phoenicis (27.4)	ι Arietis (28.0), λ Arietis (28.2)	Alrisha, χ Phoenicis (29.2)	Alamak (29.7), κ Arietis (30.3), Hamal (30.5)
October 18 (291)	19	20	21
φ Centauri (211.0), υ¹ Centauri (211.1)	υ² Centauri (211.8), τ Virginis (211.9), Agena (212.1), θ Apodis (212.5)	14h (213.1)	no star listed
φ Centauri (211.0), υ¹ Centauri (211.1)		Thuban (212.8), χ Centauri (213.0), Menkent (213.1)	no star listed

April 21 (111)	22		23

Cb1-5	Cb1-6		Cb1-7 (399)
no star listed	η Arietis (31.9)	θ Arietis (33.3)	Mira (33.7)
October 22 (295)	23		24
Al Ghafr-13 / Svāti-15 / Neck-2 / A3 / T6	Syrma, λ Bootis (215.6), η Apodis (215.8), ι Lupi, 18 Bootis (216.3), Khambalia (216.4), υ Virginis (216.5)		ψ Centauri (216.6), ε Apodis (216.8)
Asellus Tertius, κ VIRGINIS, 14 Bootis (214.8), 15 Bootis (215.2, ARCTURUS (215.4), Asellus Secundus (215.5)			ψ Centauri (216.6), ε Apodis (216.8)
April 24	25	26 (116)	27

Cb1-8	Cb1-9	Cb1-10	Cb1-11 (403)
ξ Arietis (35.0)	no stars listed		ν Arietis (38.5)
October 25	26	27 (300)	28
Asellus Primus (217.8), τ Lupi (218.1)	φ Virginis (218.7), σ Lupi (219.1), ρ Bootis (219.5)	Haris (219.7). σ Bootis (220.2), η Centauri (220.4)	ρ Lupi (221.0), Toliman (221.2)
rutua - te pahu - rutua te maeva - atua rerorero - atua hiko ura - hiko o tea - ka higa te ao ko te henua ra ma te hoi atua

Unless Metoro thought of κ Virginis (or some lesser star) it ought to have been Arcturus which was on his mind. In either case the accumulation of 'star pillars' in the night sky of April 21 (111) could have provoked the idea of drums sounding.

The first Chinese station was Horn ruled by Spica (α Virginis) which rose heliacally in day 283 (October 10, 10-10 or 8-10).

The 13th Arab manzil Al Ghafr was not ruled by Arcturus, but possibly by κ Virginis (like the Chinese Neck) or maybe by Syrma:

12	*Al Simāk*	Lofty	α Virginis (Spica)	202.7	Oct 10 (283)		192
13	*Al Ghafr*	Covering	ι (Syrma), κ, φ Virginis

Number 13 is the unlucky number for the Sun at the end of his cycle and I imagine 'covering' could refer to how the hide of the Arabs' dead old lion king was used to cover a drum.

But Arcturus was a bright star, number 3 on Chaucer's astrolabe list and number 6 of the Tahitian 'star pillars' (ana):

Ana-tahua-taata-metua-te-tupu-mavae, a pillar to stand by

Arcturus, α Bootis

The Hindu list, however, is probably at present more relevant for us and it has the sound of drums twice. The date at the beginning of the Hindu cycle, April 17, coincides with Cb1-1.

Maybe the sound of drums could have been heard 9 days earlier, in April 8 where the Hindu cycle was ending with the Revati station (possibly stretching for a further 9 days ahead):

ARIES:
1	Ashvini	β and γ Arietis	Horse's head	27 = 8 + 9
	wife of the Ashvins	Sheratan and Mesarthim		April 17 (107)
2	Bharani	35, 39, and 41 Arietis	Yoni, the female organ of reproduction	41 = 27 + 14
	the bearer	Musca Borealis		May 1 (121)
TAURUS:
3	Krittikā	M 45 Tauri	Knife or spear	55 = 41 + 14
	the nurses of Kārttikeya	The Pleiades		May 15 (135)
4	Rohini	α Tauri	Cart or chariot, temple, banyan tree	68 = 55 + 13
	the red one	Aldebaran		May 28 (148)
ORION:
5	Mrigashīrsha	λ, φ¹, and φ² Orionis	Stag's head	83 = 68 + 15
	the deer's head	Heka		June 12 (163)
6	Ardra	α Orionis	Teardrop, diamond, a human head	88 = 83 + 5
	the moist one	Betelgeuze		June 17 (168)
GEMINI:
7	Punarvasu	α and β Gemini	Bow and quiver	113 = 88 + 25
	the two restorers of goods	Castor and Pollux		July 12 (193)
CANCER:
8	Pushya	γ, δ, and θ Cancri	Cow's udder, lotus, arrow and circle	128 = 113 + 15
	the nourisher	Beehive		July 27 (208)
HYDRA:
9	*Āshleshā*	δ, ε, η, ρ, and σ Hydrae	Serpent	130 = 128 + 2
	the embrace	Uninhabited Spot		July 29 (210)
LEO:
10	Maghā	α Leonis	Royal Throne	153 = 133 + 20
	the bountiful	Regulus		Aug 21 (233)
11	Purva Phalguni	δ and θ Leonis	Front legs of bed, hammock, fig tree	169 = 153 + 16
	first reddish one	Zosma and Coxa		Sept 6 (249)
12	Uttara Phalguni	β Leonis	Four legs of bed, hammock	178 = 169 + 9
	second reddish one	Denebola		Sept 15 (258)
CORVUS:
13	Hasta	α, β, γ, δ, ε Corvi	Hand or fist	185 = 178 + 7
	the hand	Gienah (?)		Sept 22 (265)

VIRGO:
14	Chitra	α Virginis	Bright jewel or pearl	203 = 185 + 18
	the bright one	Spica		Oct 10 (283)
BOOTES:
15	Svāti	α Bootis	Shoot of plant, coral	215 = 203 + 12
	very good	Arcturus		Oct 22 (295)
LIBRA:
16	Visakha	α, β, γ and ι Librae	Triumphal arch, potter's wheel	224 = 215 + 9
	*forked, having branches (or the gift, rādhā)*	Zuben Elgenubi ?		Oct 31 (304)
SCORPIUS:
17	Anuradha	β, δ, and π Scorpii	Triumphal archway, lotus	241 = 224 + 17
	following rādhā	Vrischika (?)		Nov 17 (321)
18	Jyeshtha	α, σ, and τ Scorpii	Circular amulet, umbrella, earring	249 = 241 + 8
	the eldest, most excellent	Antares (?)		Nov 25 (329)
19	Mula	ε, ζ, η, θ, ι, κ, λ, and μ Scorpii	Bunch of roots tied together, elephant goad	260 = 249 + 11
	the root	η Scorpii ?		Dec 6 (340)

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)
LYRA:
22	Abhijit	α, ε, and ζ Lyrae	-	282 = 278 + 4
	victorious	Vega		Dec 28 (362)
SAGITTARIUS:
21	*Uttara Ashadha*	ζ and σ Sagittarii	Elephant tusk, small bed	288 = 282 + 6
	second of the ashādhā	Nunki		Jan 3 (368)
AQUILA:
23	Sravana	α, β, and γ Aquilae	Ear or Three Footprints	300 = 288 + 12
	-	Altair		Jan 15 (380)
DELPHINUS:
24	Dhanishta	α, β, γ, and δ Delphini	Drum or flute	314 = 300 + 14
	most famous (or swiftest)	Dolphin		Jan 29 (394)

AQUARIUS:
25	Shatabisha	γ Aquarii	Empty circle, 1000 flowers or stars	339 = 314 + 25
	comprising a hundred physicians	Sadachbia		Feb 23(419)
PEGASUS:
26	Purva Bhādrapadā	α (Markab) and β Pegasi (Scheat)	Swords or two front legs of funeral cot, man with two faces	350 = 339 + 11
	the first of the blessed feet	Markab		March 5 (430)
27	Uttara Bhādrapadā	γ Pegasi (Algenib) and α Andromedae (Sirrah)	Twins, back legs of funeral cot, snake in the water	368 = 350 + 18
	the second of the blessed feet	Algenib		March 23 (448)
PISCES:
28	Revati	ζ Piscium	Fish or a pair of fish, drum	384 = 368 + 16
	prosperous	Revati		Apr 8 (464)

There were probably 464 (April 8) - 394 (January 29) = 10 weeks from the first drum (or flute) to the second. This can be compared with the Mayan distance 3 * 20 + 5 = 65:


16 Pax	17 Kayab	18 Cumhu	19 Vayeb
*3 20 + 5 = 65**

I suggest drums should be sounded in autumn (because drums were instruments to be used in the dark, when the eyes were useless), and if we should count from the end of the year and backwards for 65 days, then we will reach either day 300 or day 295 (if we should count with a year which has 360 regular days).

October 22 is Gregorian day 295 and in rongorongo times this was the day when not only Arcturus rose with the Sun but also κ Virginis, which stars could be observed in the night sky of April 21.

The κ star is according to our view of the constellation not the last notable star in Virgo, but I think the letter κ indicates the point where another constellation is taking over:

Tejat Prior (η Gemini)	0.2	κ Aurigae (93.6)
...
		κ Velorum (141.5)
		κ Leonis (141.6)
...
Arcturus	- 0.6	κ Virginis (214.8)
Acrab (β Scorpii)	0.2	κ Herculis (243.5)
η Sagittarii	0.6	κ Lyrae (277.5)
Gredi (α Capricorni)	0.9	κ Sagittarii (308.1)
Bunda (ξ Aquarii)	1.2	κ Capricorni (328.7)
		κ Aquarii (342.7)
Revati (ζ Piscium)	0.7	κ Tucanae (17.6)
...
Algol (β Persei)	0.3	κ Persei (46.2)
μ Leporis	0.4	ĸ Leporis (78.0)

Sun is in Spica moving down below 0º, i.e. Sun is entering the world down below, where everything appears to be upside down. In my provisional table above κ Virginis is rising slightly later than Arcuturs, a sign of reversal.