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1. The 5th hour can probably be regarded as beginning with Zaurak (the Boat) and in day number 468 (= 4 / 24 * 360 + 408):
 
5th hour
Gb8-26 (468) Gb8-27 Gb8-28 Gb8-29 Gb8-30 (472)
 Zaurak (467.9)       Hyadum I (γ)
Gb8-30 Ga1-1 Ga1-2 (475) Ga1-3 Ga1-4 (5)
Hyadum II (δ)   Ain (ε)   Aldebaran (α)

Zaurak

γ Eridani

2.97 13º 39' S 03h 56m 59.9 467.9 467

Hyadum I

γ Tauri

3.65 15° 31′ N 04h 14m 64.4 472.4 471½

Hyadum II

δ¹ Tauri

3.77 17° 26′ N 04h 17m 65.2 473.2 472¼

 

θ² Tauri

3.40 15° 45′ N 04h 23m 66.7 474.7 473¾
Ain

ε Tauri

3.53 19º 04' N 04h 23m

 

θ¹ Tauri

3.84 15° 51′ N 04h 23m

Aldebaran

α Tauri

0.87

16° 25′ N

04h 33m

69.2

477.2

476¼

Day number 467 is the result of counting Zaurak to be 4 minutes earlier than 04h, but I prefer to have the 'Boat' at the beginning of the 5th hour.

 
Next we will consider Beid and Theemin, two more stars in Eridanus:
 

Beid

ο¹ Eridani

4.04 06° 58′ S 04h 09m 63.2 471.2 470¼

Theemin

υ² Eridani

3.81 30° 40′ S 04h 34m 69.5 477.5 476½

Measured in right ascension the distance from Beid (ο¹) to Theemin (υ²) is not far, 25m = 6¼ of a day. But if we follow the River the distance is great.

The configuration of Eridanus makes it doubtful to measure its time flow by right ascension. A somewhat better measure would be the declination. From Beid to Theemin the distance will then be 30° 40′ - 06° 58′ = 1840′ - 418′ = 1422′ = 23° 42′. But even so we can see that the great bend towards Cetus will not be properly measured. The flow of the river Eridanus seems to be outside the ordinary flow of time.

By the way, 23° 42′ happens to be quite close to the current axial tilt of the Earth: