The Sun is the most influential "planet" in Astrology. The father of the solar system, it is a masculine planet. It represents the ego, self, will power, your uniqueness and individuality. It is your identity. When afflicted you can become over ambitious, haughty and domineering. Sun takes a year to travel through the zodiac, spending about a month in each of the signs. It rules over Leo, and the house and day of the week ascribed to it are the fifth house and Sunday respectively. The friendly planets of Sun are Moon, Mars and Jupiter. While Saturn and Venus are its enemies, Mercury is neutral.