The following defines each planet by ascendant, its particular effects as lords of certain houses.The Sun, as ruler of house 11, is a planet of gains, aspirations and ideals, yet also impulse, power, prowess, violence, disease and enmity. Librans tend to have an idealistic egoism and self righteousness. They have great goals for themselves that are hard to achieve.
They can attempt too much and overextend themselves. The Sun is generally impulsive and inauspicious for Libra.
The Moon, as ruler of house 10, is a planet of power, prestige, action and realization. Librans gain influence and fame through a lunar sympathy with others. On a political level, this can give them power over the masses. They are usually progressive and aware of social trends, which they help initiate. The Moon is generally neutral but sometimes considered inauspicious (as a benefic ruling a trine).
Mars, as ruler of houses 2 and 7, is a planet of wealth and relationship and can indicate conflict over finances. Mars ruling the seventh makes relationship a potential source of conflict. Libras can project an aggressive energy into relationship or experience one through it. Mars is generally inauspicious for Libras.
Mercury, as ruler of houses 9 and 12, is a spiritual planet giving renunciation through wisdom, an idealistic sense of self sacrifice. Libran spirituality requires a strong intellectual base (Mercury) as they tend to be carried away by speculation and ambition (Jupiter). Mercury is generally the best planet for Libra both for the affairs of the inner as well as the outer life.
Jupiter, as ruler of houses 3 and 6, is a planet of energy, impulse, gains, ambition, egoism, disease and enmity. It shows conflict with friends, a critical mind, and a tendency to political or religious zeal. Librans suffer from trying too much to change the world. Though generally inauspicious, Jupiter is not always so and can give good results if it is aspected by Mercury and Venus.
Venus, as ruler of houses 1 and 8, represents self, life and longevity. It shows a tendency towards vice or passion on one hand, or profound idealism and aspiration on the other. Though generally auspicious as the ruler of the ascendant, it is tainted by its ruler-ship of the eighth.
Saturn, as ruler of houses 4 and 5, is a planet of intelligence and happiness. It indicates Librans tenacity, concentration, endurance and profundity, through which they succeed in life. Librans are stern about their principles and, when these are pure, can accomplish much inwardly as well as outwardly. Saturn is very auspicious, giving Raja Yoga.
Saturn and Mercury (lords of houses 5 and 9) in combination give spiritual growth. Saturn by itself (lord of houses 4 and 5) gives Raja Yoga or with the Moon (ruling house 10). Jupiter with Mercury and Venus gives a high idealism and love of truth and harmony. Jupiter with Mars can create violence, egoism or disease.
As a cardinal and air sign, Librans act with decisiveness once they are clear about their principles. Libra is often considered to be the best Ascendant, as the main negative planet becomes Jupiter, whose great benefic nature often makes it function in a positive way, even against the rules of house lordship.