"The heliacal rising or star rise of a star occurs annually, or the similar phenomenon of a planet, when it first becomes visible above the eastern horizon at dawn just before sunrise (thus becoming "the morning star")"*, after a complete orbit of the Sun around the Earth.
"Historically, the most important such rising is that of Sirius, which was an important feature of the Egyptian calendar and astronomical development"*, as it marked the beginning of Nile inundation and thus new agricultural year and cycle.
"In the lunar calendar, the intercalary month was added as needed to maintain the heliacal rising of Sirius in the fourth month of the season of the Harvest. This meant that the Season of the Inundation usually lasted from September to January. Because the precise timing of the flood varied, the months of "Inundation" no longer precisely reflected the state of the river but the season was usually the time of the annual flooding. This event was vital to the people because the waters left behind fertile silt and moisture, which were the source of the land's fertility."*
In contrast to the seasonif the floods, the "Season of the Harvest or Low Water was the third and final season of the lunar and civil Egyptian calendars. It fell after the Season of the Emergence (Prt) and before the spiritually dangerous intercalary month (Ḥryw Rnpt), after which the New Year's festivities began the Season of the Inundation (Ꜣḫt)."
September 11 of Gregorian calendar is corresponding to the beginning of the Egyptian New Year festivities.
The Three Wise Kings Following a Bright Star in the East Explained by Coach Renz, Why I left Religion
https://fb.watch/kjGBo44KZ6/?mibextid=Nif5oz
*Wikipedia
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