Usually, when you see stuff about astrology, it's always based on Sun sign. The type of guy/girl you should date based on your Sun sign, the kind of car you should drive by Sun sign, the type of ice cream you should eat by Sun sign (actually I've never seen that one, but it wouldn't surprise me if it pops up!). Horoscopes, articles, everything you see is centered on your Sun. But to a novice, you probably think, why? Why is the Sun so important?
The 3 main aspects of a natal chart are your Sun, Moon, and Rising. The Moon is your emotions, how you emotionally react to situations, and your Rising is how you come across, the outer you. The Sun is the inner you, the you that you are with those who know you best, the true you. Most of us have a Rising sign different from our Sun, so we come across a bit different from who we really are. But your Rising sign isn't the real you, no matter how much the people you meet might think so. It's the ultimate don't judge a book by it's cover!
Your Sun is you, the most basic part of who you are, your personality, your wants and desires, everything. It's the foundation for your astrological profile. The first thing you evaluate is the sign it's in, and then the house. If the sign and the house are ruled by the same element (fire, earth, air, water), it's easier to merge the energy (for example, I have my Sun in Libra, an air sign, in the 11th house, an air house - such an airhead!). If they're different, the energy will be altered more. If your Sun is in your 1st house, the house of the self, then you can come across more as who you really are, and have less of a problem being yourself (depending on other factors, of course). If your Sun is in your 12th house, the house of the hidden, then people probably would have a better chance at guessing your sign by throwing a dart at a board than judging your personality.
Next, look at the aspects made to your Sun. Any planets conjunct (in the same spot) or opposite (in the opposite spot) your Sun will have the most obvious impact on you. A Capricorn Sun with Jupiter conjunct will be much more optimistic and happy-go-lucky, while a Capricorn Sun with Pluto conjunct will be much more serious and intense. The oppositions and squares (90 degree aspect) will be things that are difficult for you to deal with, while sextiles (60 degree aspect) and trines (120 degree aspect) will be things you deal with more easily.
Make sure you check out The Natal Sun page for general interpretations!
(from the August 24th 2015 newsletter)