Planetary Hours How to work out the Planetary Hours Start with the planetary ruler of the day: Sunday-Sun Monday-Moon Tuesday-Mars Wednesday-Mercury Thursday-Jupiter Friday-Venus Saturday-Saturn   Find the times of sunrise and sunset for the day in question. Use an ephemeris, a local newspaper or a site like this one :  http://aa.usno.navy.mil/data/docs/RS_OneDay.html Work out the length of this sunrise-sunset period. Divide it into 12, which will give the length of twelve planetary hours. (Do the same between sunset and the next sunrise for the night hours.) They only match clock time at the equinoxes. You can then work out when each planetary hour begins. Marking the first after sunrise as the hour of the planet that rules that day use the Chaldean sequence - Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars and back to Sun again and so on - to give the planetary ruler of each hour following. With appreciation to British astrologer, Kim Farnell

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