I wrote two posts on story of primary directions. It was couple years ago, and now these posts are buried deeply in the archives of Angelicus Merlin Group. Therefore I decided to repeat that stuff and perhaps to develop the subject.
First of all, because primary directions are based on daily rotation of celestial sphere, we must have a mathematical model of this rotation to calculate directions. The first model of this rotation was made in Babylon, but astrologers of Hellenistic period mostly call it “according to Egyptians”.
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