Sun is the Lord of Simha Rashi [Leo] and occupies the central place amongst the navagrahas. Sun is also known as "The King" in the planetary cabinet. The colour of sun is red and his vahana is a chariot drawn by seven horses.
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Sun Mantra in Hindi
Japaa kusuma Sankaasam – Kaasyapeyam Mahaath’ yuthim Thamo’urim sarva Paapa ganam – Pranathosmi Dhiwaakaram.
English Translation of Sun Mantra
One who looks like the Hibiscus flower, Son of Kashyapa, full of radiance, Foe of darkness and the one who dispells all sins, I prostrate that Surya dev.
Sun Mantra Video