Lord Sun is among Panch Deva( Vishnu, Shiva, Ganesha, Shakti and Surya). He is the soul of all living beings. It is considered to be the most powerful planet among all nine planets. Since weak Sun affects eyes, heart and bones, poverty etc, so the Sun yantra grant to pacify the negative effects of Sun. It consist of dot, hexagon, two circles, eight petal lotus enveloped by one bhupura, drawn on copper, gold or bhojpatra.
Sun mantra The mantra is repeated for one hundred thousand times. The mantra of Sun for recital is || Om Hrim Ghrnih Surya Adityah Srim || The sage of this mantra is devabhaga: the metre is Gayatri and the deity is Sun-God , the lord of the day. Hrim is the Bija and Srim is shakti. The application is for realization of cherished desires.
Benefits of Sun yantra
How to do worship by this yantra
Where to place it