The Sun symbolizes cosmic intelligence, pure consciousness or the enlightened mind. The Sun is God, the Divine incarnate in nature. 

Surya (the Sun) controls the easterly direction in the house. It symbolizes light and clarity in the mind, reason and willpower. Correspond to the male principle of Yang.
Use the Sun Yantra if you want to:
- get an influx of vital energy, remove blockages, increase your activity;
- strengthen authority, perseverance, willpower, optimism, and self-esteem;
- more easily and successfully achieve goals, implement plans in life;
- free yourself from arrogance, selfishness, envy, anger, irritability;
- harmonize and strengthen the cardiovascular system;
- solve the problem of character weakness, lethargy;
- achieve high social status, success, and fame.

The most powerful method is to place the sun's Yantra in the place where the window in the East is missing. 
This will strengthen the powers of the Sun in the house on a subtle plane. 
The effect of the presence of Yantra is based on a combination of symbols, geometric elements, color and mantra. 
Since defects mainly affect the subtle planes, Yantra is able to harmonize them. 
These plans are sensitive to color, symbols, artistic and geometric elements.