What are the 36 decans?
The decans (/ˈdɛkənz/; Egyptian bꜣktw or baktiu, “[those] connected with work”) are 36 groups of stars (small constellations) used in the ancient Egyptian astronomy to conveniently divide the 360 degree ecliptic into 36 parts of 10 degrees each, both for theurgical and helialical horological purposes.