In the website https://lra.le.ac.uk/handle/2381/8546 there is the doctoral thesis by Sarah Symons entitled **"*Ancient Egyptian Astronomy: timekeeping and cosmography in the New Kingdom"-* 1999, pages. 230 It is very complete!
In the thesis also the old Egyptians sundials and the seasonal hours are discussed, with tables, graphs, formulas, etc. (page 128-151) Regards Gianni Ferrari
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