Lagadha, an ancient Indian astronomer, is credited with developing the concept of the zodiac, which divides the ecliptic into twelve equal parts.

Jantar Mantar is the name of the ancient Indian observatory built by Maharaja Jai Singh II in the 18th century.

Aryabhata, an ancient Indian astronomer, proposed the heliocentric model of the solar system in the 5th century AD.

Surya Siddhanta is the name of the ancient Indian text that contains astronomical observations and calculations.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the circumference of the Earth in the 5th century AD.

Ujjain Observatory is the name of the ancient Indian observatory built in Ujjain.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the position of the planets in the 5th century AD.

Nalanda Observatory is the name of the ancient Indian observatory built in Nalanda.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the time of eclipses in the 5th century AD.

Takshashila Observatory is the name of the ancient Indian observatory built in Takshashila.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the distance to the Moon in the 5th century AD.

Jantar Mantar is the name of the ancient Indian observatory built in Delhi.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the distance to the Sun in the 5th century AD.

Jantar Mantar is the name of the ancient Indian observatory built in Varanasi.

Aryabhata, an ancient Indian astronomer, developed a method for calculating the time of sunrise and sunset in the 5th century AD.