The standard way of reckoning planetary hours is as follows.
For daylight hours look up the times of sunrise and sunset. Calculate the total time and divide by 12. This gives your the clock time for each daylight 'hour'
The first hour of each day (i.e. begining at Sunrise) is governed by the planetary ruler for the day. Thus the first 'hour' of Monday is ruled by the Moon. Planetary hours rulerships follow in Chaldean order - so the second daylight hour on Monday is ruled by Saturn, then Jupiter, then Mars, Sun, Venus, Mercury and back to the Moon. Do not include the outer planets.
After Sunset, the sequence of rulerships continues, so if the last daylight hour ruler is Jupiter, the first night ruler will be Mars. However the clock time for night hours will be different from daylight hours (except at the equinoxes). So you need to find the length of clock time between Sunset and Sunrise on the following day and divide that by 12 to get the nocturnal 'hours'.
In Winter nocturnal hours will be longer than daylight hours and in Summer the reverse is the case. In the Northern Hemisphere we are just past the Spring equinox so currently daylight hours are longer than nocturnal hours.
As the hour lengths change from day to day, calculation can be a pain unless you have a handy computer program!
