I far prefer the gregorian calendar but I have added -for the historian's pleasure- the corresponding date of the julian calendar.
Altitude of Sirius = 2°
The following table describes the heliacal rising of Sirius between -2500 and -1500 at the latitude of Thebes.
The data in relation with the julian calendar are printed in blue. Those about the gregorian calendar are printed in red.
As you can see, the heliacal rising of Sirius is, in the julian calendar, unwedged by only one day in a millenary. This so called fixity must not hide the truth for it's only the result of the added action of two displacements which - it's a perfect hazard - make up for each other.
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