GChase Wrote:
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>
> Here is the ceiling from the tomb of Seti I
> showing his Heb Sed :
>
>
>
> The two halves of the vaulted ceiling illustrated
> the northern half of the sky (bottom) and the
> southern half of the sky (top). The Hed Sed
> hieroglyph was shown on the left of register above
> the 11 gods.
> These 11 gods together with the 9 gods on the
> right hand side were probably the two Enneads that
> had approved Seti’s entry to the stars at the
> celestial pole.
>
> We see Seti 1 standing between Ursa Major (the
> Bull) and Ursa Minor (the base level)
>
> The bull was tethered to the mooring post and
> rotated around the pole. The picture of it was
> shown as a hieroglyph (from Gardiner’s list)
>
> The picture on the ceiling reads ‘Bull’,
> but unfortunately gives us no other information
> about its orientation, nor the stars that make up
> the asterism.
>
> So in this case we could claim that the two stars
> Alioth and Mizar of Ursa Major are the hooves of
> the two centre legs. The resurrected Seti 1
> directly beneath was pointing to the bull.
> The base line had stars of Ursa Minor - Kocab and
> Pherkad. Pherkad was at the base of the mooring
> post (held by hippo goddess Taweret) and the star
> Thuban was at the top of it.
>
> Under the bull was ‘the sacrificer’ with a falcon
> head. Sometimes he held a spear pointing at the
> bull. Here he holds a rope which went under the
> bull’s feet, with a small loop in the centre.
> Normally bulls were not speared for a sacrifice,
> but brought to the ground first and then the
> throat was cut. First the rope was tied around the
> legs of the bull. The front left leg was put into
> the loop. A bit similar perhaps to this scene:

There is quite a lot of material online regarding possible interpretations of the various Egyptian celestial diagrams. The known Egyptian celestial diagrams date from around 1450BCE. One of the best papers that I know of that discusses the Egyptian firmament is by Jose Lull and Juan Belmonte and is freely downloadable here: [www.academia.edu]