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2. The Age of Taurus thus should have began around 4000 B.C. and it could have ended with the Pleiades at spring equinox around 2100 B.C. (= 1900 A.D. minus 55.3 * 72):

Gb8-22 (*55) Gb8-23 Gb8-24 Gb8-25 Gb8-26 Gb8-27
Atiks, Rana (55.1) The Pleiades (55.3-56.3)   Menkhib (57.6) Zaurak (58.9)  
'May 15 '16 '17 '18 '19 '20 (140)

Although we can see that the stars ξ and ο are rising earlier. We should map these and at the same time also incorporate λ and ν in our data base:

ο 03h 24m 48.84s 03h 24.814m 51.2
ξ 03h 27m 10.12s 03h 27.169m 51.8
λ 04h 00m 40.82s 04h 00.680m 60.3
ν 04h 03m 09.38s 04h 03.156m 60-9
Aldebaran 04h 35m 55.20s 04h 35.920m 69.2
Menkar α Ceti 2.54 03º 54' N 03h 00m 45.7
Algol β Persei 2.09 40º 46' N 03h 05m 46.9
Misam κ Persei 3.79 44º 40' N 03h 06m 47.2
Botein δ Arietis 4.35 19º 32' N 03h 09m 47.9
Zibal ζ Eridani 4.80 09º 00' S 03h 13m 49.0
Algenib α Persei 1.79 49º 41' N 03h 21m 51.0
  ο Tauri 3.61 09° 02′ N 03h 22m 51.2
  ξ Tauri 3.73 09° 44′ N 03h 24m 51.8
Atiks ο Persei 3.84 32º 08' N 03h 41m 56.1
Rana δ Eridani 3.52 09º 56' S
Celaeno 16 Tauri 5.45 24º 08' N 03h 42m 56.3
Electra 17 Tauri 3.72 23º 57' N
Taygeta 19 Tauri 4.30 24º 19' N
Maia 20 Tauri 3.87 24º 13' N 03h 43m 56.6
Asterope 21 Tauri 5.76 24º 24' N
Merope 23 Tauri 4.14 23º 48' N
Alcyone η Tauri 2.85 23º 57' N 03h 45m 57.1

Atlas

 27 Tauri 3.62 23º 54' N 03h 46m 57.3

Pleione

 28 Tauri 5.05 23º 59' N
Menkhib ζ Persei 2.84 31º 44' N 03h 51m 58.6
Zaurak γ Eridani 2.97 13º 39' S 03h 56m 59.9
  λ Tauri 3.41 12° 29′ N 03h 58m 60.3
  ν Tauri 3.91 05° 59′ N 04h 01m 60-9

Beid

ο¹ Eridani

4.04

06° 58′ S

04h 09m

63.2

Hyadum I

γ Tauri

3.65

15° 31′ N

04h 14m

64.4

Hyadum II

δ¹ Tauri

3.77

17° 26′ N

04h 17m

65.2

 

θ² Tauri

3.40

15° 45′ N

04h 23m

66.7

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

Theemin

υ² Eridani

3.81

30° 40′ S

04h 34m

65.5

Hassaleh

ι Aurigae

2.69

33° 05′ N

04h 54m

74.6

Almaaz

ε Aurigae

3.03

43° 49′ N

04h 59m

75.7

Haedus I

ζ Aurigae

3.69

41° 05′ N

04h 59m

75.8

After adjusting the right ascension positions of λ and ν Tauri with 1 day they will find their places at Gb8-26--27:

Gb8-22 (*55) Gb8-23 Gb8-24 Gb8-25 Gb8-26 Gb8-27
Atiks, Rana (55.1) The Pleiades (55.3-56.3)   Menkhib (57.6) Zaurak (58.9), λ Tauri (59.3) ν Tauri (59.9)
'May 15 '16 '17 '18 '19 '20 (140)
Gb8-28 (*61) Gb8-29 Gb8-30 (472)
  Beid (62.2) Hyadum I (63.4)
4h (60.9) '22 '23 (143)

The same procedure puts ο and ξ close to the 'wing' of Perseus and they are today rising heliacally ca 50 days beyond equinox.

Gb8-17 (*50) Gb8-18 Gb8-19 Gb8-20 Gb8-21
Algenib Persei (50.0), ο Tauri (50.2)  ξ Tauri (50.8)      
'May 10 (130) '11 '12 '13 '14
1700 B.C        

50 * 72 = 3600, i.e. the date was around 1700 B.C.

People evidently found it difficult to abandon the Pleiades as a sign of where the new year began. Today they rise heliacally around May 17 or ca 2 months after the equinox.

Gb8-22 (*55) Gb8-23 Gb8-24 Gb8-25 Gb8-26 Gb8-27
Atiks, Rana (55.1) The Pleiades (55.3-56.3)   Menkhib (57.6) Zaurak (58.9), λ Tauri (59.3) ν Tauri (59.9)
'May 15 '16 '17 '18 '19 '20 (140)
  2100 B.C