Jyesthadeva was a 16th-century Indian astronomer and mathematician. He is best known for his commentary on the Surya Siddhanta, called the Yuktibhasa.

The Yuktibhasa is a commentary on the Surya Siddhanta, one of the most influential astronomical texts in India. It provides a detailed explanation of the astronomical theories and methods presented in the Surya Siddhanta.

The Yuktibhasa primarily discusses the geocentric model, which is a model of the universe in which the Earth is at the center and the Sun, Moon, and other planets revolve around it.

Jyesthadeva used the astrolabe, a device used to measure the altitude of celestial bodies, to make his observations.

Jyesthadeva compiled an astronomical table called the Karanaratna, which contains data on the positions of the Sun, Moon, and planets.

Jyesthadeva used the grahaparivartana method, which is a method of calculating the time of an eclipse based on the positions of the Sun and Moon.

Jyesthadeva used the madhyama method, which is a method of calculating the position of a planet based on its mean motion.

Jyesthadeva used the drishti method, which is a method of calculating the distance between two planets based on their apparent positions.

Jyesthadeva used the manda method, which is a method of calculating the size of a planet based on its apparent diameter.

Jyesthadeva used the sphuta method, which is a method of calculating the mass of a planet based on its apparent brightness.

Jyesthadeva used the drishti method, which is a method of calculating the density of a planet based on its apparent volume.

Jyesthadeva used the manda method, which is a method of calculating the temperature of a planet based on its apparent color.

Jyesthadeva used the sphuta method, which is a method of calculating the composition of a planet based on its apparent spectrum.

Jyesthadeva used the drishti method, which is a method of calculating the age of a planet based on its apparent surface features.

Jyesthadeva used the manda method, which is a method of calculating the evolution of a planet based on its apparent history.