Dhruvaa Astro Club

Astronomers & Notable Personalities

Aryabhata (476–550 CE)

Era: 476–550 CE

Field: Mathematical Modelling of Star Motions

Often called the Father of Indian Astronomy.
Key contributions:

Proposed that Earth is spherical and rotates on its axis, explaining apparent stellar motion.

Suggested a proto‑heliocentric idea: Earth’s revolution around the Sun (though still using epicycles).

Wrote the Aryabhatiya (499 CE), a 248‑verse mathematical–astronomical treatise.

Calculated π = 3.1416, centuries ahead of Europe.

Developed precise methods for solar and lunar eclipse prediction.

Introduced early trigonometric functions (sine tables).

Bhāskara

Era: 600–680 CE

Field: Mathematician and Astronomer

A direct follower of Aryabhata.
Key contributions:

Wrote commentaries clarifying Aryabhata’s work.

Produced highly accurate sine approximations.

Helped standardize Aryabhata’s astronomical system for later generations.

Bhāskara II

Era: 1114–1185 CE

Field: Astronomer and Author

Also known as Bhaskaracharya, author of Siddhānta Śiromaṇi.
Key contributions:

Developed advanced planetary motion models.

Proposed concepts resembling calculus (rates of change).

Improved eclipse calculations and astronomical instrumentation.

Brahmagupta

Era: 598–668 CE

Field: Astronomer

One of India’s greatest mathematician‑astronomers.
Key contributions:

Wrote Brahmasphuṭasiddhānta (628 CE).

Formalized rules for zero and negative numbers.

Improved Aryabhata’s planetary models using epicycle–deferent systems.

Calculated Jupiter’s synodic period with ~99% accuracy.

Explained lunar libration and phases.

His mathematical astronomy influenced Islamic and later European astronomy.

Sawai Jai Singh

Era: 1688–1743 CE

Field: Astronomer and Builder

A king‑astronomer who revived observational astronomy.
Key contributions:

Built monumental open‑air observatories (Jantar Mantar) in Jaipur, Delhi, Ujjain, Mathura, Varanasi.

Designed large instruments for precise positional astronomy.

Updated astronomical tables using both Indian and Islamic sources.

Varāhamihira

Era: 505–587 CE

Field: Astronomer

A polymath of Ujjain and one of the “Nine Gems” of King Vikramaditya’s court.

Key contributions:

Authored the Bṛhat Saṃhitā and Pañcasiddhāntikā.

Synthesized five astronomical schools (the Siddhantas) into a unified system.

Advanced methods for planetary calculations, weather prediction, and astrological astronomy.

Integrated Greek, Roman, and indigenous Indian astronomical ideas.