Sun is the lord of the solar system and Mercury instills this energy to neurons for the development of brain cells. If Sun is freedom of self and sense of ego, Mercury is consciousness and sanctity of existence, wise and wisdom. The conjunction of both Sun and Mercury constitutes a famous proverbial, prowess and praiseworthy yoga called as Budh-Aditya Yoga.
The legitimacy of this yoga starts when it gets extra strength from the sign of own, exaltation or friends such as Aries, Gemini, Cancer, Leo, Virgo and Sagittarius. It uplifts the life of the native with certainty. If the yoga germinates in the sign of debilitation which are Libra or Pisces, it is ruined by the association or aspect of malefics such as Mars, Saturn, Rahu and Ketu. Mercury is exalted in Virgo and debilitated in Psices, therefore, if this is apprehensible how Sun-Mercury in Libra, Capricorn and Pisces will enmoure the native what they give effects in Aries, Gemini, Leo, and Virgo.
If this yoga is in the ascendant, the native may be erudite, talkative, intelligent and long lived.
The best example of this yoga can be discussed by analyzing the chart of Abraham Lincoln. In his chart Sun-Mercury occupies ascendant and is free from all malefics. By being s son of poor and illiterate father who was unable to serve his son, he was inspired by inherent energy of harmonious disposition of strong ascendant, Sun-Mercury conjunction and aspect of divine Jupiter on ascendant lord Saturn. As a result his mind was equipped with sensible, active, and humourous brain cells. He studied under the lamp posts on road and he fulfilled his dream to reshape his country. One day he was sworn in as the president of most powerful country America.
The good and the bad aspect of this yoga disposited in the 7th house and having malefic effect by the proximity of Mars and aspect of Saturn, appear in the life of Adolf Hitler who started his career as a house-painter. The relationship between Mars and Saturn is pernicious and can cause sudden calamity. Hitler was then appointed as the Chancellor of Germany on 30th Jan.
The presence of Sun-Mercury in 10th house bestows the native name, fame and prosperity all over the world and the person enjoys the life like a king.
It is also observed that a native with Budha-Aditya yoga are bold, efficient, sincere and erudite. They have an inherent source of energy which helps them to achieve the goals of their life. They also possess an amazing endurance and hence never gets disheartened or degraded on failure. Panna or Emerald is the luckiest gemstone for Mercury.