The Vedanga ("member of the Veda") are six auxiliary disciplines for the understanding and tradition of the Vedas. Shiksha : phonetics and phonology (sandhi) Chandas : meter Vyakarana : grammar Nirukta : etymology Jyotisha : astrology and astronomy, dealing particularly with the auspicious days for performing sacrifices. Kalpa : ritual Traditionally, vyākaraṇa and nirukta are shared across all four Vedas, while each veda has its own śikṣā, chandas, kalpa… (More on Vedanga)