The Egyptians had two calendars, the Canicular or Sothis year of 365.25 days and a ritual calendar that had 36 Decans of 10 days each, followed by 5 festival days.
The Canincular Days refer to the roughly 60-day period of the overflowing of the Nile in the Summer. These are named after Sirius (the dog star), whose annual rising marked the new year.