Every day of the week is governed by a different planet. Additionally, the hours of the day are governed by planets.
This can be determined by beginning with the hour of sunrise, which is the first hour of the day.
The first hour of each day is governed by the planet associated with that day.
After this, each hour after sunrise is attributed to a different planet, commencing with Saturn, Jupiter, Mars, the Sun, Venus, Mercury, and the Moon.
These are the seven conventionally used planets. After the Moon, you commence again with Saturn, reiterating the same order.
For instance, Mars would rule the first hour of Tuesday, followed by Saturn, then the other six planets in the same order until sunrise the following day.
Gambling and speculation are associated with or governed by the fifth house;