Aryabhata is considered to be the father of Indian astronomy due to his significant contributions to the field, including the development of the Aryabhatiya, a treatise that revolutionized Indian astronomy.

Aryabhata proposed the heliocentric model of the solar system, which places the Sun at the center and the Earth and other planets revolving around it. This model was later adopted by Nicolaus Copernicus in the 16th century.

The astrolabe is an astronomical instrument that was developed by ancient Indian astronomers to measure the position of celestial bodies. It consists of a circular metal plate with a graduated scale and a movable pointer.

Brahmagupta developed the concept of zero and introduced it to the world. He also developed the Brahmagupta's formula for solving quadratic equations.

Brahmagupta's Formula is a mathematical theorem that was discovered by ancient Indian mathematicians and is used to calculate the area of a triangle. It states that the area of a triangle is equal to half the product of its base and height.

Bhaskara II developed the theory of planetary motion and proposed the idea of elliptical orbits. He also developed a method for calculating the circumference of the Earth.

Jantar Mantar is an astronomical observatory that was built by Maharaja Jai Singh II in the 18th century. It consists of a collection of architectural instruments that were used to study the movement of celestial bodies.

Varahamihira developed the concept of the precession of the equinoxes, which is the gradual shift in the position of the equinoxes over time.

Aryabhatiya is a mathematical text that was written by Aryabhata and contains important contributions to mathematics and astronomy. It includes topics such as arithmetic, algebra, geometry, and trigonometry.

Varahamihira developed the concept of the zodiac and the system of 12 zodiac signs. He also wrote several works on astrology and astronomy.

Brahmasphuta Siddhanta is a mathematical text that was written by Bhaskara II and contains important contributions to mathematics and astronomy. It includes topics such as arithmetic, algebra, geometry, and trigonometry.

Aryabhata developed the concept of the sine function and used it to calculate the height of celestial bodies. He also developed a method for calculating the circumference of the Earth.

Brahmasphuta Siddhanta is a mathematical text that was written by Brahmagupta and contains important contributions to mathematics and astronomy. It includes topics such as arithmetic, algebra, geometry, and trigonometry.

Bhaskara II developed the concept of the tangent function and used it to calculate the distance to celestial bodies. He also developed a method for calculating the circumference of the Earth.

Lilavati is a mathematical text that was written by Lilavati and contains important contributions to mathematics and astronomy. It includes topics such as arithmetic, algebra, geometry, and trigonometry.