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The Babylonian list with 23 stars on the Central path of Anu did not include Eridu:

23 stars on the Central Path of Anu

The Field

The seat of Ea, which leads the stars of Anu (4 stars of the Square of Pegasus)

4

The star at the Field (head and neck of Pegasus, and western fish in Pisces)

Swallow

5

The star behind the Field (northern fish in Pisces)

Anunitum

6

The star behind it (Dumuzi or Aries)

Hired Man

7

Star Cluster

The Seven Gods, the great gods (Pleiades)

8

Bull of Heaven

The Bull's Jaw, the Crown of Anu (Taurus, or at least its head)

9

True Shepherd of Anu

Papsukal, the messenger of Anu and Ishtar (Orion)

10

The Twins opposite the True Shepherd of Anu (Cetus and a part of Eridanus)

Lulal & Latarak

11, 12

The star behind him (Lepus)

Rooster

13

Arrow

Arrow of the great god Ninurta (Sirius and probably other stars in Canis Major)

14

Bow

Elamite Ishtar, the daughter of Anu (Puppis)

15

Serpent

Ningishzida, lord of the Underworld (Hydra)

16

Probably there were 3 paths in order to cover more of the sky:

... Chatley and others have believed that for the Kai Thien cosmologists the sun itself moved in right ascension and declination, making sudden jumps from time to time; the existence of the ecliptic being ignored or denied. Whether this was really their view seems rather difficult to substantiate, but the ideas of some of the Old Babylonian astronomers before about -500 may have been quite similar. 7 (dark) lines for the sun to jump over (just as at noon) and 6 paths to advance along. But originally there perhaps were only 4 lines and 3 paths:

.. Assyriologists have long been familiar with a number of cuneiform tablets which were preserved in the library of King Assurbanipal (Ashur-bāni-apli, -668 to -626) at Nineveh, but which date as to contents from the late -2nd millenium. These show diagrams of three concentric circles, divided into twelve sections by twelve radii. In each of the thirty-six fields thus obtained there are constellation-names and certain numbers, the significance of which has not yet been explained ...

Much light has been thrown upon the diagrams by modern attempts at reconstruction and interpretation. Could they not be regarded as primitive planispheres, showing both the circumpolar stars and the equatorial 'moon-stations' corresponding to them? Such a view seems to be supported by the most recent researches. The tablets with 'planispheres' belong to the class now known as that to the 'Enuma (or Ea) Anu Enlil' series. The corpus contains some 7000 astrological omens, and the time of its formation was contemporary with the Shang period, i.e. from about -1400 to -1000. The planispheres consist of 'three roads', each marked with twelve stars, one for each of the months according to the time of their heliacal risings.

... Those of the central road, the equatorial belt, were known as the Stars of Anu; those of the outer road were asterisms south of the equator (Stars of Ea), while the inner road was travelled by the northern and circumpolar asterisms (Stars of Enlil).

After this time the planispheres are no more seen, but their place is taken by lists of stars, modified and much improved, on the tablets of the 'Mul-Apin' series (c. -700) - so called because one of the three lists begins with the 'star' (mul) Apin, i.e. a constellation composed of γ Andromedae and stars in Triangulum. The Chinese also recognised this group, as the 'Great general of the heavens' (Thien ta chaing-chün) ... he set heliacally in autumn, the season for punishments ...

Thus we ought to look for Eridu (Canopus, Agastya) in the star list of Ea:

15 stars on the Path of Ea

Fish

The lead star of the stars of Ea (Fomalhaut)

1

Great One

Ea  (Aquarius)

2

Eridu

Ea  (Vela)

3

Ninmah

The star to his right (Vela)

4

Fomalhaut (the Mouth of the Fish) defined the beginning of the Path of Ea:

... The Mouth of the Fish (Fomalhaut, α Piscis Austrini - or Piscis Notius) rose with the Sun 103 - 62 = 41 days earlier than Achernar, and 41 was the essential number connected with the place for birth (Bharani at *41) ...

MOUTH OF THE FISH (FOMALHAUT)
Heliacal rising 234 Midnight culmination
March 3 (*347, 428 = 62 + 366) October 25 (298)
236 = 8 * 29½ (= 366 - 5 * 26)
ACHERNAR (END OF THE RIVER)
Heliacal rising 233 Midnight culmination
April 13 (*23, 469 = 103 + 366) December 3 (*257)
234 = 9 * 26

The location of the Mouth of the Fish was immediately before the Square of Pegasus:

CLOSE TO THE SUN:
22 DECEMBER 23 24 25 26 (360)
*DECEMBER 24 25 26 (360) 27 28
Gb2-27 (π) Gb2-28 (54) Gb2-29 (284) Gb2-30 Gb2-31
ι Cephei (346.0), λ Aquarii, γ Piscis Austrini, σ Pegasi (346.5) SCHEAT AQUARII =  δ Aquarii (347.0), ρ Pegasi (347.2), δ Piscis Austrini (347.4), FOMALHAUT (Mouth of the Fish) = α Piscis Austrini, τ Gruis (347.8) FUM AL SAMAKAH (Mouth of the Fish) = β Piscium (348.3), ζ Gruis (348.5), ο Andromedae (348.9) Al Fargh al Mukdim-24 / Purva Bhādrapadā-26 / House-13 (Pig)

SCHEAT PEGASI = β Pegasi, π Piscis Austrini (349.3), κ Gruis (349.4), MARKAB PEGASI = α Pegasi (349.5)

23h (350.0)

υ, θ Gruis (350.0), π Cephei (350.6), ι Gruis (350.9)

March 2 3 4 5 (64) 6 (*350)
°February 26 27 28 °March 1 (60) 2 (*346)
'February 3 4 (35) 5 (*321) 6 7
"January 20 21 22 23 24 (*309)
CLOSE TO THE FULL MOON:
22 JUNE 23 24 25 26 (177)
*JUNE 24 25 26 (177 = 6 * 29½) 27 28
ν Hydrae (163.1) no star listed (164)

ALTAIR (α Aquilae)

Wings-27 (Snake)

η Oct. (165.4), ALKES = α Crateris (165.6)

ANA-TIPU-4 (Upper-side-pillar - where the guards stood)

MERAK = β Ursae Majoris (166.2), DUBHE = α Ursae Majoris (166.7)

11h (167.4)

χ Leonis, χ¹ Hydrae (167.1), χ² Hydrae (167.3)

August 31 September 1 (*164) 2 (245) 3 (182 + 64) 4 (*350 + 183 - 366)
°August 27 28 29 (*161) 30 (242) 31
'August 4 (216) 'August 5 6 7 8 (*140)
"July 21 22 / 7 (π) 23 (204) 24 (*125) 25

From hipu at left in the π glyph Gb2-27 (as in 22 / 7) to hipu in Gb4-17 there were 108 - 53 = 55 days - equal to the number of feathers in Gb6-21--24:

69
Gb6-19 (285 + 117) Gb6-21 Gb6-22 Gb6-23 (229 + 177)
June 29 (180) 25 APRIL (115) 12 + 13 + 15 + 15 = 55
ω Aquarii (359.2), 78 Pegasi (359.5) ψ Andromedae (360.1), σ Phoenicis (360.4) γ¹ Oct. (361.4), φ Pegasi (361.7) DZANEB (Tail) = ω Piscium (362.4), γ² Oct. (362.8) η Tucanae (363.0), ψ Pegasi (363.1), 32 Piscium (363.2), π Phoenicis (363.4), ε Tucanae (363.6), τ Phoenicis (363.9) θ Oct. (364.4)
π (73) March 15 16 17 18 19 (78)
ζ Pavonis (283.4), λ Cor. Austr. (283.6), DOUBLE DOUBLE = ε Lyrae (283.7), ζ Lyrae (283.8) *JANUARY 6 7 8 9 10
4 JANUARY (187 + 183 = 370) 6 (115 + 73 + 183) 7 8
Te Pou 73 (= 365 / 5)
13 5
Ga1-4 Ga1-5 Ga1-6 Ga1-20 Ga1-26
Ana-muri (Aldebaran) ζ Herculis, η Tr. Austr. (252.1), η Herculis, β Apodis (252.5) ATRIA = α Tr. Austr. Al Nitak (The Girdle) Winnowing Basket (Nash)
*68 *69 *253 *84 *273 (18h)
May 28 (148) 29 30 (*70) June 13 (164) 19 (*273 - 183)
*MARCH 21 (80) 22 23 *APRIL 8 (*18) *APRIL 14 (4-14)
19 MARCH (78) 20 21 (0h) 6 APRIL (*16) 12 APRIL (*21)
23

CLOSE TO THE SUN:
FEBR 17 (413) 18 19 (50) 20 (*336) 21 (417)
Gb4-13 Gb4-14 Gb4-15 Gb4-16 (336) Gb4-17 (108)
ξ¹ Ceti (32.1) χ Persei (33.2), θ Arietis (33.3), MIRA = ο Ceti (33.7) no star listed (34) ξ Arietis (35.0), ρ Ceti (35.4), ξ² Ceti (35.9) σ Ceti (36.9)
April 22 23 (*399 = *33 + 366) 24 (480 = 114 + 366) 25 (115) 26 (*36)
°April 18 19 20 (*396) 21 (111) 22 (*32)
'March 26 (85) 27 28 (*373) 29 (*8) 30 (455)
"March 12 13 3-14 (73) 15 16 (*360)
CLOSE TO THE FULL MOON:
AUGUST 19 (*151) 20 21 22 23 (235)
Al Ghafr-13 / Svāti-15 / TAHUA-TAATA-METUA-TE-TUPU-MAVAE-6 (a pillar to stand by)

15 Bootis (215.2), ARCTURUS = α Bootis (215.4), ASELLUS SECUNDUS = ι Bootis (215.5), SYRMA = ι Virginis, λ Bootis (215.6), η Apodis (215.8)

ι Lupi, 18 Bootis (216.3), KHAMBALIA = λ Virginis (216.4), υ Virginis (216.5), ψ Centauri (216.6), ε Apodis (216.8) ASELLUS PRIMUS = θ Bootis (217.8) τ Lupi, δ Oct. (218.1), φ Virginis (218.7)

FOMALHAUT (α Piscis Austrini)

σ Lupi (219.1), ρ Bootis (219.5), HARIS = γ Bootis (219.7)
October 22 (295) 23 24 25 26
°October 18 (291) 19 20 21 22
'September 25 (268) 26 27 (*190) 28 29
"September 11 (254) 12 13 14 (*177) 15

I have here chosen to illuminate such heliacal dates which appear to be in harmony with the glyphs, for instance FEBRUARY 24 (417 = 52 + 365) at Gb4-17. These dates were 64 right asension days earlier than the dates at the time of rongorongo, for instance was April 26 (116) = 52 + 64. At the time of Gregory XIII the precessional depth down to the time when Aldebaran rose with the Sun at 0h had been 68 - 4 = 64 days.

In the Gregorian calendar October 22 was day 295 (= 10 * 29½) counted from January 1 and 64 precessional days earlier the date would have been AUGUST 19 (day 151 counted from 0h). *215 - *151 = *64.

Probably October 22 also motivated the exceptional beginning of the text on side b of the C tablet:

Cb1-1 (393) Cb1-2 Cb1-3
E tupu - ki roto o te hau tea
April 17 (107) 18 19
'March 21 (80) 22 23
Al Sharatain-1 / Ashvini-1 / Bond-16

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)
Muphrid (210.1), ζ Centauri (210.3) φ Centauri (211.0), υ¹ Centauri (211.1), υ² Centauri (211.8), τ Virginis (211.9) Agena (212.1), θ Apodis (212.5), THUBAN (212.8)
October 17 (290) 18 19
'September 20 21 22 (265)
Cb1-4 (396)
ki te henua - te maro
April 20 (*30)
'March 24 (*3)
2h (30.4)

κ Arietis (30.3), HAMAL (30.5)

Alkes

14h (213.1)

χ Centauri (213.0), Menkent (213.1)

October 20 (293)
'September 23 (266)
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
Cb1-5 Cb1-6 (398) Cb1-7
April 21 (111) 22 (*32 = *398 - 366) 23 (*399 = *33 + 366)
'March 25 (84) 26 27 (*372 = *6 + 366)
η Arietis (31.9) no star listed (32) θ Arietis (33.3), MIRA (33.7)
Neck-2

Asellus Tertius, κ VIRGINIS, 14 Bootis (214.8)

Al Ghafr-13 / Svāti-15

TAHUA-TAATA-METUA-TE-TUPU-MAVAE

15 Bootis (215.2), ARCTURUS (215.4), Asellus Secundus (215.5), 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)
October 21 (*214) 22 (295) 23
'September 24 (*187) 25 (268) 26
 
Cb1-8 (400) Cb1-9 Cb1-10 Cb1-11 (403)
April 24 (*400) 25 26 (116) 27
'March 28 29 30 31 (90)
no star listed (34) ξ Arietis (35.0) no star listed (36) no star listed (37)
Asellus Primus (217.8) τ Lupi (218.1), φ Virginis (218.7)

Fomalhaut

σ Lupi (219.1), ρ Bootis (219.5), Haris (219.7) σ Bootis (220.2), η Centauri (220.4)
October 24 25 26 27 (300)
'September 27 28 29 30 (273)

... The leap day was introduced as part of the Julian reform. The day following the Terminalia (February 23) was doubled, forming the 'bis sextum - literally 'double sixth', since February 24 was 'the sixth day before the Kalends of March' using Roman inclusive counting (March 1 was the 'first day'). Although exceptions exist, the first day of the bis sextum (February 24) was usually regarded as the intercalated or 'bissextile' day since the third century. February 29 came to be regarded as the leap day when the Roman system of numbering days was replaced by sequential numbering in the late Middle Ages ...

The silent bird (Cb1-11) at heliacal October 27 (300) would in Roman times have been in 'September 30 (273 = 3 * 91). Terminalia was in 'February 23 (31 + 23 = 54), which when counting from 'January 1 in the previous year would be one more than day 365 + 53 = 418 = 300 + 4 * 29½ = 3 * 91 + 290 / 2, i.e. corresponding to the place where someone was running away in Gb4-18:

CLOSE TO THE SUN:
FEBR 22 (418) TERMINALIA 24 (*340) 25 (56) 26
Gb4-18 Gb4-19 Gb4-20 (111) Gb4-21 Gb4-22 (342)
ν Ceti (37.9) ν Arietis (38.5), δ, ε Ceti (38.8) μ Arietis (39.4), HEAD OF THE FLY = 35 Arietis (39.6), KAFFALJIDHMA = γ Ceti, θ Persei (39.8) π Ceti, ο Arietis (40.0), ANGETENAR = τ¹ Eridani, μ Ceti (40.2), RIGHT WING = 39 Arietis (40.9) Bharani-2 / Stomach-17 (Pheasant)

π Arietis (41.2), MIRAM = η Persei (41.3), BHARANI = 41 Arietis (41.4), τ² Eridani, σ Arietis (41.7)

April 27 28 (118) 29 (484) 30 May 1 (*41)
°April 23 24 25 (115) 26 (*36) 27
'March 31 (455) 'April 1 (91) 2 3 (*13) 4
"March 17 18 19 (78) 20 (444) 0h (*365)
CLOSE TO THE FULL MOON:
AUG 24 (236) 25 (*157) 26 27 28
σ Bootis (220.2), η Centauri (220.4) ρ Lupi (221.0), TOLIMAN = α Centauri (221.2), π Bootis (221.8), ζ Bootis (221.9) 31 Bootis (222.0), YANG MUN = α Lupi (222.1), RIJL AL AWWA = μ Virginis (222.5), ο Bootis (222.9) IZAR = ε Bootis (223.0), 109 Virginis, α Apodis (223.3), μ Librae (223.8) Al Zubānā-14a / Visakha-16 / Root-3 (Badger)

ZUBEN ELGENUBI = α Librae (224.2), ξ Bootis, ο Lupi (224.5)

October 27 (300) 28 29 (*222) 30 31
°Octoberl 23 24 25 (*218) 26 27 (300)
'September 30 (273) 'October 1 2 (*195) 3 4
"September 16 17 (260) 18 (*181) 19 20
Ga6-16 Ga6-17 (157) Ga6-18 Ga6-19 Ga6-20