Surya Namaskar - Who is SUN GOD?

Who is Sun God ?
According to the Hindu Mythology, 'Sun' is the son of MAA Athithi. She is another form of Aadhi. Sun is the Root cause and Head of All 'Vedhas'and treated as a 'DEVA' - 'Surya Dhevo Bhava'. Fire and Heat is the combination his formation.
The word 'SURYA' means "Energy of the Almighty". Sun has two wives. They are 'Sanchana' and 'Chaayaa'.
Sanchana was not able to withstand the 'Thejas' the energy full exposure and posed her in another form and left her with Sun God. Then Sun made that form in to seven horses and retained in his Holy Chariot. Sun and Sanchana had three issues. They are MANU, YAMA & YAMUNA.

Sun parade in a seven horsed Chariot and sitting on a Lotus. His Charioteer is 'Sri Arna'. Sri Arna is elder to 'Sri Garuda'. Sri Arna is in charge of ' Ushath kala' -  'Pre Dawn'. Sri Arna is an expert in Chariot riding with his exemplary techniques.  Also he protects every living being in getting affected with the tremendous power of Surya Deva.