

Sun in Aries
The Sun represents our conscious self, the ego, our vitality, how we shine in the world and our creativity.
In general, when the Sun is in Aries (21 March - 20 April), it is the beginning of the spring season, when nature reawakens to life, after a long sleep during winter (no wonder the last month of winter is under the Sun in Pisces). Because of this theme of spring and rebirth the Sun is exalted in the vivacious sign of Aries, meaning the symbolism of the luminary mentioned above (ego, vitality, creativity, joy, self-expression) is easily expressed through the bold action-oriented, individualistic sign of Aries.
These people seem full of life and are capable of putting out a lot of energy into the world. They seem passionate in the way they express themselves. They can initiate things easily and rapidly without being indecisive or overthinking things. Their self confidence makes them act spontaneous and in the moment, sometimes being impulsive. There is a tendency to not think things through before acting (although other placements like Saturn in aspect to the Sun can balance this out), and to be overly preoccupied with oneself without taking into consideration other people's needs ( sign in opposition to Libra). If you want a decision making person Sun in Aries is perfect for the job. Being ruled by Mars, Sun in Aries people need to find ways to express their over the top energy, otherwise it can turn into irritation, or even violence. People with Aries Sun will be rather confrontational than compromising, and because sun represents vitality these people may feel energized by conflict.
Because we are talking about the Sun, all things mentioned above are expressed consciously by people with this placement and although that may not represent their inner emotions (which is shown by the Moon sign) or what they value (Venus) it is how they want the world to perceive them, how they project themselves into the external world and also how they see themselves.​​
Sun can also represent the father or people in authority. These people can encounter very fiery-tempered authority figures, and they should be careful on how they act and speak with their bosses, because conflict can arise more easy with people in power. The father, or the idealized version of a man can have a more alfa-male behavior.​​
Sun can also give hints about the career a person chooses. Because Sun in Aries is ruled by Mars, a career in sports, athletics goes very well. I've noticed many women in tennis have Aries placements, and some (Maria Șarapova and Karoline Pliskova) have Sun in Aries. A good option can be working in the military (if you have some Saturn in there for discipline), carriers that involve physical activity and acting quickly/ emergency responses (lifeguard, police, firefighter, mountain rescuer, paramedic, etc).

Aries, a cardinal masculine fire sign is the first sign on the zodiac wheel and is ruled by the planet Mars, being associated with initiation, boldness, action and individuality.

Sun in Taurus
The Sun symbolizes the conscious ego, our projection into the world, how we shine. Taurus is a Fixed Earth sign ruled by Venus. Taurus rules things like: finances, propriety, resources, food, beauty, physical pleasure and stability.
Here the native with Sun in Taurus likes to project a very stable person (financially and emotionally). The person's energy is put into acquiring material possessions. The native finds joy in being surrounded by beautiful and expensive items. There could be a lack of motivation or passivity because of the energy of Venus, the planet that rules Taurus. Having money and resources is crucial for the self esteem of these people. Sun in Taurus presents a conservative personality to others. Physical beauty is important for these people and they will most likely spend money on looking good. Sun in Taurus natives may be resistant to change.
Taurus being a Fixed Earth sign, gifts the Sun with the ability to be grounded and patient. Taurus Sun will take it's time to shine. If you have other placements that give impulsivity and rashness like Aries placements, the Sun in Taurus will balance them out.
Sun also represents authority figures (your father, boss, etc). You could see people in authority as a source of stability. The father or father figure was constantly present in the native's life and provided material and emotional stability to the child (unless the Sun is receiving a hard aspect from Saturn, Pluto, etc).
Sun is also our creative expression. We can be creative in business and about making money or we could be talented at designing beautiful things like jewelry, clothes, home decorations (especially if Venus is also in Taurus). These natives know what to invest their money in to multiply it. They can be real-estate or land owners and earn money through passive income.
Sun also represents career and personal achievements. These people can be great business entrepreneurs, They'll also do great in real estate and hospitality business.

Sun in Gemini
The Sun is our ego, the conscious self, the identity we show to the world. It is different from the Moon, which shows the inner emotional self and how we really feel about things. The Sun represents our achievements and what makes us proud about ourselves.
Sun in Gemini could present a very social, communicative and intellectual personality to the world. They pride themselves with their brilliant minds and general knowledge (similar to a Sun in Sagittarius). But unlike Sagittarius that can really grasps one subject, and Scorpio who can study a subject in depth, Gemini knows about a lot of topics on a superficial level. Their natural curiosity is what leads them to be interested in many subjects.
Sun in Gemini like being seen in social settings. They have great social skills and know how to network with other people. They are adaptable to things and situations and they pride themselves with this skill.
People with the Sun in Gemini do not stay in one place for to long. They like to move around, meet new people and expand their social network. They could study different kind of topics and take many educational courses, but sometimes they don't finish what they start.
Gemini and Mercury is associated with youth. These people either have a youthful appearance and presence, or they are admired by young people.
You can see these natives in careers involving communication like journalism, advertising and marketing, customer service, commentary on social platforms, etc
Sun in Mercury can become famous on the internet and social media especially through motivational speech.

Sun in Leo
The Sun rules the zodiac sign of Leo. This is the most comfortable placement because the Sun is at home here. The Sun is the ego, the conscious self, how we shine in the world, our vitality, creativity and life-force. It also shows our career, the achievements we are proud of and is a symbol of authority. Leo is the sign of royalty, and is associated with things of the 5th house like children, romance, joy.
Sun in Leo people have a very confident ego. They easily get recognition and admiration for their achievements or just for being themselves. Because Leo is a regal sign and the Sun represents authority, Leo Sun usually has some kind of higher status in society. Many celebrities and important social figures have the Sun in Leo. These people can be very creative and have artistic pursuits. Leo Sun can be very generous (more so with Leo Moons but the Leo Sun also). They are somehow considered special in their peer group and get attention very easy for just expressing themselves. They are fun to be around and generally have an aura of positivity and joy. Leo Suns do well in positions of leadership. Because Leo is a fixed sign, Leo Suns tend to be loyal to their friends, family, peer group and to their ideals and causes, but also they can become ”fixated” on their ego. The Fire element gifts them with a lot of energy and vitality and also with honesty which should not be confused with naivety by others. Leo Suns can be romanticized in their peer group and it is easy for people to think they have fallen in love with them.
On the negative Leo Suns can be too full of themselves, arrogant, bossy and in need of attention. They can become or can attract narcissists. The need for attention and central stage is usually can determine them to make a spectacle of themselves and others and they can stir up drama. Their happy positive attitude and vulnerable can come off as shallow to others.
Leo is linked to cinematography, theatrics and drama. These people can became great actors. Because they are great leaders they can shine in positions of power and authority.