There are six Vedanga mentioned in the Upanishads
1. Shiksha (phonetics),
2. Kalpa (rituals),
3. Vyakarana (grammar)
4. Chhanda (metrics)
5. Nirukta (etymology)
6. Jyotishya (astronomy)
Shiksha : Shiksha is one of the six Vedangas, treating the traditional Hindu science of phonetics and phonology of Sanskrit. Its aim is the teaching of the correct pronunciation of the Vedic hymns and mantras.
Kalpa : One of the six disciplines of Vedanga, treating ritual.
Vyakaran : The Sanskrit grammatical tradition of vyakarana is one of the six Vedanga disciplines. It has its roots in late Vedic India, and includes the famous work, Astadhyayi, of Panini.
Chhanda : In Sanskrit, it refers to the study of Vedic meter in Classical Sanskrit poetry.
Nirukta : Nirukta ("explanation, etymological interpretation") is one of the six Vedanga disciplines of Hinduism, treating etymology, particularly of obscure words, especially those occurring in the Vedas. The discipline is traditionally attributed to Yaska, an ancient Sanskrit grammarian. In practical use, nirukta consists of brief rules (sutras) for deriving word meanings, supplemented with glossaries of difficult or rare Vedic words.
Jyotish : Jyotisa (Sanskrit jyotisa, from jyotis- "light, heavenly body": also anglicized Jyotish and Jyotisha) is the Hindu system of astrology (also known as Indian astrology, Hindu astrology, and of late, Vedic astrology). Traditionally, it has three branches -
1. Siddhanta : traditional Indian astronomy.
2 a. Samhita
b. Medini Jyotisha (mundane astrology) : Predicting important events based on analysis of astrological dynamics in a country's horoscope or general transit events such as war, earthquakes, political events, financial positions, electional astrology; house and construction related matters (Vastu Shastra), animals, portents, omens etc.
3. Hora : Predictive astrology based on analysis of natal horoscopes and the moment a query is made.