*UPDATE*Good update, needs improvement
*UPDATE BELOW*
Older version: I have been using this app for sometime, but for Traditional Astrology the Planetary Day rulership starts over at sunset.
So on Monday the moon rules the rising hour and the setting hour.
This is a staple of all Traditional methods, perhaps an option can be added.
New version: Here is an explanation of the proper calculation desired by Traditional Astrologers (via Renaissance Astrology);
"get your local sunrise and sunset times from the newspaper or the US Naval Observatory. Take the time from sunrise to sunset and divide by twelve to get the length of each planetary hour for the day. Take the time from sunset to sunrise the next day and divide that by twelve for the length of each planetary hour by night. Then starting with the planet that rules the day, e.g. Saturn for Saturday, follow the Chaldean order and assign the proper planet to each planetary hour of the day and night that you have just calculated."
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Hours, v3.0.1