Indian Astronomical Theories and Models

Aryabhata, in his work 'Aryabhatiya', proposed a heliocentric model where the Earth rotates on its axis and revolves around the Sun.

In Indian astronomy, 'grahas' are the celestial bodies that move relative to the fixed stars, including planets, the Sun, and the Moon.

Varahamihira, in his work 'Pancasiddhantika', presented a model for predicting solar and lunar eclipses based on astronomical observations.

The 'Surya Siddhanta' is believed to have been composed around 500 CE and is considered one of the most influential texts in Indian astronomy.

The 'Nakshatras' are 27 lunar mansions used in Indian astrology and astronomy to mark the Moon's position in its orbit around the Earth.

Bhaskara II, in his work 'Siddhanta Shiromani', proposed a model of the universe where each planet had its own set of satellites, resembling a system of planetary systems.

The 'Pancasiddhantika' is a compilation of five astronomical treatises from different schools of Indian astronomy, providing insights into various astronomical theories and models.

The 'Brihat Samhita' is an encyclopedic work by Varahamihira that covers various topics, including astrology, astronomy, architecture, and gemology.

The 'Lilavati' is a mathematical treatise by Bhaskara II that focuses on arithmetic, including topics like fractions, square roots, and progressions.

The 'Bijaganita' is a mathematical treatise by Bhaskara II that focuses on algebra, including topics like quadratic equations, indeterminate equations, and Diophantine analysis.

The 'Siddhanta Shiromani' is a comprehensive astronomical treatise by Bhaskara II that covers topics like planetary motion, eclipses, and spherical astronomy.

The 'Yuktibhāṣā' is an astronomical treatise by Jyeṣṭhadeva that covers topics like planetary motion, eclipses, and the construction of astronomical instruments.

The 'Siddhāntaśekhara' is an astronomical treatise by Śrīpati that covers topics like planetary motion, eclipses, and the construction of astronomical instruments.

The 'Grahalāghava' is an astronomical treatise by Gaṇeśa that covers topics like planetary motion, eclipses, and the construction of astronomical instruments.

The 'Tantrasamgraha' is an astronomical treatise by Nīlakaṇṭha Somayājī that covers topics like planetary motion, eclipses, and the construction of astronomical instruments.