When a planet is in its exalted state, it exerts a great deal of power and generates outcomes that make the most of the inherent capabilities and energy that the planet has.
Because the Sun is at its most powerful position in Aries, this is the ideal sign for the Sun. Your heart (both physically and symbolically), your ego, and the very essence of who you are all fall within Aries' domain.
Because Mars is the planet that regulates activity and determination, the Sun sign Aries is now in the driver's seat thanks to this development.
When a planet is said to be in domicile, it indicates that it is "at home" and at ease with the energies that are associated with a certain sign.
Because the Sun makes its permanent home in the sign of Leo, this is the second-best Sun sign to be born under.
This leads in an infectious friendliness and an ability to have fun, both of which are traits that are associated with the Leo sign.
The fact that Scorpio is also co-ruled by Mars, like Aries, places it in third place among the Sun signs.
As Sharpe notes, "everyone wants to be a Scorpio" because of the sign's concentrated and determined nature, as well as its alluring air of sexual mystery and allure.