It is believed that at the specific time you are born, every particular celestial body (it could be the Moon, the Sun and even the planets) were at a particular point in the sky. The horoscope of the individual tells the astrologer which zodiac sign matches with each of these points that these celestial bodies make in the sky and that is how the astrologer comes to know the planetary signs of the individual. Going through the year, every planet passes through every sign which is why at times, a number of planets appear in the same sign. But many of us are born under the natural placements which is when a specific planet happens to be in the sign that it rules over.
So, which are the planets which rule over the signs or more specifically the houses?
Now, while Rahu and Ketu do not come under this list because of the fact that they are not actual planets and they do not exist in the solar system, the rest are the planet Mars which is known as the commander in chief, the planet Mercury which is known as the finance department, the Sun which is known as the king, the planet Venus which is known as the Mistress, the planet Jupiter which is known as the Advisor, the Moon which is known as the Queen and the planet Saturn which is known as the servant.
The alignment of the planets in the twelve houses.
the Sun which is known as the King, gives its best results when it is present in the house of Aries. The Sun enjoys its control of power in this house, and that is why the Sun is exalted in this house of Aries.
Taurus- following the king is the queen, and Moon is exalted in this house of Taurus. The queen is placed right next to the king, and exercises her powers in this house.
the king does not allow anyone else to sit next to the queen, so while this house is ruled by the planet of Mercury, there is no planet that resides in this house because of this very reason, and there no planet that is as powerful as the queen, therefore no planet is aligned towards this house.
the advisor is aligned towards this house, which means that the planet of Jupiter is aligned to this house of Cancer which is ruled by the queen, that is the Moon. The advisor is powerful and advices the queen who in turn advises the king.
Leo- as this house is ruled by the Sun, there is no planet that is strong or powerful enough to be aligned in this house of Leo.
this house is ruled by the planet Mercury who is the financial advisor, and therefore is another planet which is powerful and cannot let anyone else align itself in this house other than itself.
this house is ruled by the planet Venus, yet the planet Saturn is powerful in this house as the Sun lose all his power in this house. Because the sun loses all his power when he visits the Mistress of the house, the servant, that is the planet Saturn rules over this house and is powerful in the house of Libra.
this house is ruled by the planet Mars which is known as the commander, and here, the Sun is powerful in this house of Scorpio.
this house does not rule anyone as powerful as this is the house of the advisor, where no one is treated to be greater than the other, in this house of Sagittarius, everyone is treated equally.
this house is ruled by the planet Saturn but the commander gains power here, and the advisor loses power, and becomes humble in this house of Capricorn.
this house is the house where no one enjoys power as it is the secondary house of the planet Saturn.
this house allows the Mistress to be powerful as she gains power in this house of Pisces.