Vedangas help us read, write, chant and understand Veda mantras or vedic hymns (Slokas). These are called Limbs of Vedas or Shadangas.
Rig Veda is not complete unless it is studied with its Appendices called : Siksa,Vyakarana, Chandas, Nirukta, Kalpa and Jyotisa texts .
Siksha deals with mainly phonetics and it is the science disciplining the efforts of ear, vocal cords, etc.,.
Vyakarana is grammar of Sanskritic slokas and it deals with forms of words, their combination, usage and semantic nuances.
Nirukta deals with etymology dealing with objective definition of words.
Chandahs is the science for determination of metrical forms and qualities of mantras.
Kalpa deals with and justifies Vedic Hindu yaga rituals.
Jyotisha is study of the Universe,i.e.,astrology or astronomy to determine the configuration and position of stars and planets etc., in order to fix favourable or propitious times for performing Yagas or Hindu rituals and for .
Vyakarana and Nirukta are unique to each Veda.
Whereas Siksha, Chandas, Kalpa and Jyotisa are common for all Vedas.
Then there are Mimamsa, Nyaya, Purana and Dharma sastras.
Mimamsa is divided into Purva Mimamsa and Uttara mimamsa. First one deals with conduction of Vedic rutuals. Uttara mimamsa helps us understand Vedanta knowledge.
Nyaya sastra is also called Tarka Sastra.
Nyaya sastra teaches us the logical determination of nature and qualities of matter and standards of Judgements and assessment of Values and promotes one to attain Moksha.
Manu dharma sastra, Yajnavalkya smruti, Mitakshari, Datta Mimamsa etc are some of the prominent dharma sastras.
Commentaries by Medhatiti, Govindaraja, Kallukabhatta are available to read Manu Smriti.
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