For Aries ascendant Sun is the lord of the 5th house so let us first understand the area signified by the 5th house & 3rd house in the horoscope.
5th house in a horoscope signifies children, creative intelligence, past karmas, belly area which includes your pancreases, liver, gall bladder etc.
3rd house in a horoscope signifies communication, intelligence, siblings etc.
When Sun is in 3rd house for Aries ascendant then Sun is placed in Gemini sign. There are three constellation which falls in Gemini namely
Mrigashira from 0° – 6° 40’ of Gemini
Aardra from 6°40’ - 20° of Gemini
Punarvashu from 20° - 30° of Gemini
Sun falling in different constellation/nakshatras will give different result and hence a generic result of Sun in 3rd house for Aries ascendant may not work for all the person equally.
Therefore, results based on placement of Sun in different Nakshatras can be more insightful for the seeker.
Do not know where Sun is placed in your horoscope visit mykundali
Sun in 3rd house in Mrigashira nakshatra i.e. between 0° – 6° 40’ of Gemini
Native’s children will be very intelligent and successful.
Native will have issues relating to skin, boils and eruptions.
Person will have good communication skills.
Native will have more male siblings.
Benefic effects will be minimized when Sun in the first 5 degrees of Gemini.
https://tenor.com/search/communication-gifs
Sun in 3rd house in Aardra nakshatra i.e. between 6°40’ - 20° of Gemini –
Native will have female child, having dark complexion and attractive face.
Native will be blessed with intuitive ability.
Younger sibling of the native may have health issues.
Native will be highly creative and intelligent.
Native will be a very adapt speaker, he/she will be able to influence a large audience with his speech.
Person with this placement can become personnel advisors to ministers, bureaucrats, public speaker etc.
https://tenor.com/search/motivational-speaker-gifs
Sun in 3rd house in Punarvashu i.e. between 20° - 30° Gemini –
Native will have more of male children, having fair complexion, muscular body and clear voice.
Native will have at-least one elder sibling.
Native will be highly religious and intelligent.
Native will love to read and research on religious texts.
Person with this position shall perform puja and donation to get results of purva punya.
Person with this position can become successful foreign diplomats, professors, online tutors etc.
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Thumbnail Image Courtesy:
https://i.thehoroscope.co/sun-in-3rd-house-how-it-shapes-your-destiny-and-personality/