The Egyptians held fast to a complicated calendar with two different mutually shifting years and festivals. They had a 365 day calendar which included five additional feast days and a Sothis calendar of 365 1/4 days based on the helical rising of the star Sothis (Sirius). This was later called the Canicular Year ( Sirius is known as the "dog star" and dog in Latin is canis). The Egyptians knew that the two of the calendars would be out of step after 1,461 years and would make adjustments accordingly. Prior to the adoption of the solar calendar, the Egyptians followed a lunar calendar. The change-over from lunar to solar measurement is perhaps reflected in the mythic tale in which the Creator forbids Geb (father earth) and Nut (mother sky) from engaging in intercourse. They disregard his wishes and after Nut conceives, the Creator decrees that she shall bear her offspring "in no month of the year." The poor mother, heavy with child and in extreme distress, sought the help of Thoth who agreeably engaged the Moon in a dice game in which the prize was five additional days. Thoth won the game and offered them to Nut who could now bear her children by Geb "in no month of the year." The additional days bring the lunar calendar and the solar calendar into harmony.