The ancient Egyptian name for the season of the Nile flood was Akhet, conventionally transliterated from Egyptian hieroglyphs. Akhet was the first of the three seasons in the Egyptian civil calendar, followed by Peret, the season of emergence, and Shemu, the season of harvest.
The season referred to the annual inundation of the Nile, which deposited nutrient-rich silt across Egypt’s floodplain. This natural cycle made intensive agriculture possible in a landscape otherwise dominated by desert. Egyptian farmers timed planting and harvesting around the river’s changing level, while officials and priests connected the flood to divine order and the fertility of the land.
Akhet generally corresponded to roughly September through January, although the exact dates shifted because the flood and the ancient calendars did not align perfectly. Sopdet, one of the tempting alternatives, was the Egyptian name associated with the star Sirius, whose heliacal rising helped mark the agricultural year. Peret and Shemu were later seasons, not names for the inundation itself.