Planetary Hours Calculator
Real-time planetary hours calculated from your actual sunrise and sunset using the Skyfield astronomical library and JPL ephemeris data.
Detecting your location...
Planetary hours divide the period between sunrise and sunset into 12 equal "day hours," and sunset to next sunrise into 12 equal "night hours." Each hour is ruled by one of the seven classical planets following the Chaldean order: Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon, repeating endlessly. The first hour of each day is ruled by that day's planet — Sunday starts with the Sun, Monday with the Moon, Tuesday with Mars, and so on. This system has been used for timing magical operations, prayers, and practical decisions for over 2,000 years.
This calculator uses the Skyfield astronomical library with NASA JPL DE440 ephemeris data for precise sunrise and sunset times at your exact location.