Heliacal Rising of Sirius

The heliacal rising of Sirius refers to the first appearance of the star Sirius in the eastern sky just before dawn, following a period of being hidden by the Sun. This event typically occurs around early July in the Northern Hemisphere. Historically significant for ancient civilizations, such as the Egyptians, it marked the start of the annual flooding of the Nile and the beginning of their new year. The rising of Sirius was also associated with various agricultural and cultural events, highlighting its importance in timekeeping and navigation in ancient societies.