In fact, according to calculations made on the basis of the heliacal rising of the star Sirius (Sothis) and inscriptions found by archaeologists, this date must have been October 22.
Enligt kalkyleringar som gjorts vad gäller stjärnan Sirius (Sothis) heliakiska uppgång och inskriptioner som hittats av arkeologer, måste datumet varit den 22 oktober.