The Vedic scriptures of the Hindu religion refer to the sun as the store house of inexhaustible power and radiance. The Sun God is referred to as Surya or Aditya. The Vedas are full of hymns describing the celestial body as the source who sustains all life on earth. The origin of the worship of the Sun in India is thus several centuries old. Bihar has some of the popular Sun temples.Some of these Sun Temples located in Bihar are:
Deo

One of the most famous Sun temples is situated here. Deo is situated in Aurangabd district of Bihar, 150 km from state capital Patna. Deo is the most ancient of all sites where the King Aila of Prayaga (Allahabad) was cured of leprosy.
Surajpur
Situated in Nalanda district which is approximately 90 kms from Patna, the village has been named after the Sun himself. The place is known for its beautiful sculpture of Surya and Buddhist deities.
Deo Barunark
It is located 99 kms from Patna. There are ruins of several temples dedicated to the Sun God. In one of the temples are the remains of the Sanctum Sanctorum and the Assembly Hall with its ornamental pillars.
Deo Markandeya
Nearly 119 kms from Patna is the site of Sun temple marked today by a small structure containing a number of sculptures of solar deities.
Chhath Puja, although initially organized and celebrated exclusively by the people of Bihar, later it embraced people across the country. Presently research and experiments establish the view that a good number of festivals which have resemblances to Chhath Puja are celebrated all across the world. So, in a way, Chhath Puja can be considered not only as a domestic or national festival but also it’s a festival of international brotherhood and national sensitivity.
Deo surya mandir is pride of our Aurangabad and very historical temple as well please keep it up such more information