Ādityahṛdayam

Ādityahṛdayam (आदित्यहृदयम्, ) is a Hindu devotional hymn, dedicated to Āditya or Sūrya (the Sun God), found in the Yuddha Kānda (6.105) of Vālmīki's Rāmāyana. It was recited by the sage Agastya to Rāma in the battlefield before fighting with the Rakshasa king Rāvaṇa. In it, Agastya teaches Rāma the procedure of worshiping Āditya for strength to defeat the enemy.

Etymology
Āditya (आदित्य, lit. "son of Aditi") refers to the Sun. Hṛdayam (हृदयम्) is the Sanskrit word for "heart".

Structure
The Ādityahṛdayam is made up of thirty śhlokas which can be divided into six sections: