Chhand

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From: Hindupedia

Chandas is the science of metres. Syllables are classified into two categories, Guru and Laghu. A string of Guru-Laghu sequence of a particular length is called a metre. There are various metres in which the Vedic mantras are composed, such as Gayatri, Anusthup, Trishtup and Jagati. The chandas of a mantra determines its usage, such as its purpose and context. But it acts more as an error-correcting mechanism. Since the Veda is an oral tradition, any aberration in the chandas because of error in text or the swara, can be easily identified and corrected. Text: Pingala's Chandassastra.