How did the Egyptians use the stars to predict the Inundation?

The ancient Egyptians relied on the heliacal rising of the star Sirius (known as Sopdet) to predict the annual inundation of the Nile River. This event typically occurred around mid-July, marking the start of the flooding season essential for agriculture. The appearance of Sirius in the pre-dawn sky signaled the impending rise of the Nile, allowing farmers to prepare for planting. This astronomical event was so significant that it was integrated into their calendar and religious practices.