The Rigveda, one of the four Vedas, contains hymns and verses that mention astronomical observations and celestial bodies.

Jyotisha was the term used in ancient India to refer to the study of astronomy and celestial phenomena.

Aryabhata is widely regarded as the father of Indian astronomy for his significant contributions to the field.

Varahamihira's Brihat Samhita is a comprehensive text covering various topics, including astronomy, astrology, and architecture.

The Surya Siddhanta is known for its accurate methods for calculating the positions of planets and other celestial bodies.

Aryabhata's Aryabhatiya introduced the concept of zero and the decimal system, which revolutionized mathematics and astronomy.

The Nakshatras are used in astrology, astronomy, and navigation for various purposes, including determining auspicious times and predicting celestial events.

Panchanga is a Hindu calendar system that combines astronomical data with astrological information.

The Surya Siddhanta contains detailed observations and methods for predicting eclipses, demonstrating the advanced astronomical knowledge of ancient India.

Aryabhata was the first Indian astronomer to propose the concept of precession of the equinoxes, which refers to the gradual shift in the position of the equinoxes over time.

The Surya Siddhanta is regarded as the most comprehensive and influential astronomical text in Indian astronomy, providing a detailed exposition of astronomical theories and calculations.

Graha in ancient Indian astronomy refers to planets, which were believed to have a significant influence on human affairs and were studied extensively.

The ancient Indian astronomers primarily used the quadrant, known as 'Yantra,' for astronomical observations and measurements.

Varahamihira's Brihat Samhita extensively discusses planetary conjunctions and their astrological implications, providing insights into ancient Indian astrological practices.

The ancient Indian astronomers divided the zodiac into 12 signs, known as 'Rashis,' which correspond to the 12 constellations along the ecliptic.