1. In astrology, each of the three 10-degree divisions of a zodiac sign, each associated with different planetary influences and characteristics.
Usage: astrology; plural of decan
2. In ancient Egypt, a group of stars or a division of the sky used in timekeeping and astronomical observation.
Usage: historical; astronomy

Examples

• Astrologers divide each zodiac sign into three decans to provide more detailed personality readings.
• The first decan of Aries is said to be ruled by Mars.
• Ancient Egyptian astronomers tracked the decans to measure the passage of time at night.
• Your birth chart may show influences from multiple decans depending on your exact birth date.
• The decans were important celestial markers in Egyptian religious and agricultural calendars.