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

The Jantar Mantar is a collection of architectural astronomical instruments, including sundials, that were used to measure time and track the movement of celestial bodies.

Aryabhata, in the 5th century CE, proposed the idea that the Earth rotates on its axis and revolves around the Sun, which was a revolutionary concept at the time.

The Panchang combines the lunar and solar cycles to create a calendar that is used for religious, agricultural, and astrological purposes.

Surya, the Sun god, is frequently represented in Indian art, often depicted riding a chariot drawn by seven horses, symbolizing the days of the week.

Varahamihira, in the 6th century CE, founded the astronomical observatory at Ujjain, which became a center for astronomical studies and observations.

Trigonometry, particularly the concept of sine and cosine functions, was extensively used by Indian astronomers to calculate the positions and movements of celestial bodies.

The Nakshatras are 27 divisions of the ecliptic, each associated with a specific constellation and used for astrological predictions.

Brahmagupta, in the 7th century CE, recognized and described the phenomenon of the precession of the equinoxes, where the Earth's axis slowly shifts over time.

The Surya Siddhanta, written by Aryabhata in the 5th century CE, is a comprehensive astronomical treatise that covers topics such as planetary motion, eclipses, and the calculation of time.

Aryabhata, in the 5th century CE, introduced the concept of the zero digit and its use in the decimal system, revolutionizing mathematics and astronomy.

The armillary sphere, a spherical model representing the celestial sphere, was used by Indian astronomers to visualize and study the movements of celestial bodies.

Aryabhata, in the 5th century CE, proposed the idea that the Earth is spherical and rotates on its axis, challenging the prevailing flat Earth belief at the time.

Algebra, particularly the concept of indeterminate equations, was extensively used by Indian astronomers to solve complex astronomical problems and derive mathematical solutions.

Bhaskara II, in the 12th century CE, proposed the idea that the Earth's orbit around the Sun is elliptical, rather than circular, which was a significant advancement in astronomical understanding.