The Egyptian Book of the dead by P. Le Page Renouf and Edouard Naville

supposed to be swallowed by the Crocodile of the West. It was stated in note 3 to chapter 15 that the ⁂⁂⁂ are _stars_.[50] Besides the ⁂⁂⁂⁂⁂⁂⁂⁂ the _stars which set_ and the ⁂⁂⁂⁂⁂⁂⁂ the _circumpolar stars_, whose navigation ⁂⁂⁂ ⲥⲱⲕ is continuous, there are the ⁂⁂⁂⁂⁂⁂⁂⁂ whose name is very significant. ⁂⁂⁂ and ⁂⁂ have the sense of _turning back_,[51] and the only stars whose apparent motion is ever retrograde are the _planets_. All these stars are supposed as divinities to aid in the navigation of the Bark of Rā. The Egyptians could not have had a correct planetary theory (which only became possible through Kepler), but they understood at least that the motions of the planets were _regular_, and that they depended upon the Sun. Eudoxus is reported to have derived the data for his theory from his Egyptian instructors.