The Surya Siddhanta, an ancient Indian astronomical treatise, was translated into Greek in the 6th century CE and had a profound impact on Greek astronomy.

Aryabhata, an Indian mathematician and astronomer, is credited with making significant contributions to Greek astronomy through his work on trigonometry, planetary motion, and the heliocentric model.

The astrolabe, a versatile instrument used for astronomical calculations and observations, was introduced to Greek astronomers through Indian sources and became an essential tool in their studies.

Indian astronomers made significant contributions to trigonometry, particularly in the development of trigonometric functions and the calculation of trigonometric tables, which were later adopted and expanded by Greek astronomers.

Indian astronomers held the view that the Earth was spherical, which was later adopted by Greek astronomers and became a fundamental concept in their cosmological models.

Indian astronomers developed the concept of epicycles and deferents to explain the variations in planetary motion, which was later adopted by Greek astronomers and became a key element in their geocentric models.

Indian astronomers placed significant emphasis on the study of constellations and their astrological significance, which influenced Greek astronomers' interest in these areas.

The concept of Ayanamsa, which refers to the gradual shift of the vernal equinox, was introduced by Indian astronomers and later adopted by Greek astronomers to account for the precession of the equinoxes.

Indian astronomers relied primarily on naked-eye observations, which influenced Greek astronomers to focus on visual observations and develop sophisticated observational techniques.

The concept of the Rasi Chakra, which refers to the zodiacal belt divided into 12 signs, was introduced by Indian astronomers and later adopted by Greek astronomers, becoming a fundamental aspect of their astrological practices.

Indian astronomers developed methods for predicting lunar and solar eclipses, which were later adopted by Greek astronomers, enabling them to make accurate predictions of these celestial events.

The concept of Kalpa, which refers to a vast cycle of time, was introduced by Indian astronomers and later adopted by Greek astronomers, influencing their understanding of the cyclical nature of time and the universe.

Indian astronomers held the view that the universe was infinite and boundless, which influenced Greek astronomers to consider the possibility of an infinite universe, challenging the prevailing notion of a finite cosmos.

The concept of Shunya, which refers to zero, was introduced by Indian astronomers and later adopted by Greek astronomers, revolutionizing their mathematical and astronomical calculations.