In Egypt, in very ancient times, it was noticed that the flooding of the Nile River begins soon after the star Sirius appears in the morning

In Egypt, in very ancient times, it was noticed that the flooding of the Nile River begins soon after the star Sirius appears in the morning in the east. In what month did this take place in Egypt about 2000 BC? When is this happening now in Russia?

1) To solve this problem, it is necessary to mentally move the vernal equinox point to the constellation Aries and set the star globe for the middle latitude of Egypt 30њ s. latitude. Then we will find that this morning rise of Sirius occurs 2 months after the vernal equinox, i.e. around May 21. From that day the so-called “sand days” or vacations began in Egypt. And since the flood of the Nile usually began after the appearance of Sirius just before the sunrise, the “sand days” or “vacations” were of great importance for the whole agricultural Egypt.
2) In Russia, Sirius is now visible in the mornings in the east in mid-August, i.e. “Dog days” or vacations in Russia now begin in mid-August.

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