The provided source material does not describe a city in Kosovo named Decan; instead, it defines "decans" as an astronomical and chronological system used in ancient Egypt. A decan is one of 36 groups of stars utilized to divide the 360-degree ecliptic into 36 parts of 10 degrees each. These divisions served both heliacal chronometrical purposes and theurgical functions.
In ancient Egyptian astronomy, each decan appeared geocentrically to rise consecutively on the horizon during a daily Earth rotation. The rising of a specific decan signaled the start of a new "hour" of the night. Historical records indicate that this system was used as a nocturnal beginning by at least the Ninth or Tenth Dynasty of Egypt in the 21st century BC.