In Vedic astrology, a Hora is an astrological planetary hour ruled by one of the seven classical planets: Sun, Moon, Mars, Mercury, Jupiter, Venus, or Saturn. Rather than a fixed 60-minute clock hour, a Hora is determined by dividing daylight (sunrise to sunset) into 12 equal segments, and nighttime (sunset to sunrise) into 12 equal segments.
The word Hora derives from the Sanskrit word Ahoratra (meaning day and night), taking the middle syllables. In electional astrology (Muhurat), computing local Hora timings allows you to identify favorable windows during the day for specific actions based on prevailing planetary influences.