The Surya Siddhanta is an influential Sanskrit astronomical text that presents a comprehensive system of Indian astronomy and astrology.

Astronomy in ancient India served multiple purposes, including religious rituals, navigation, timekeeping, and the development of calendars.

The Saptarishi, also known as the Big Dipper or Ursa Major, was a crucial constellation for ancient Indian sailors as it helped them determine the direction of north.

The gnomon, a simple device consisting of a vertical rod or pillar, was widely used by ancient Indian astronomers to measure the altitude of celestial bodies and determine the time of day.

Lagadha, an ancient Indian astronomer, is credited with developing the concept of the zodiac and the system of 27 nakshatras, which played a crucial role in Indian astrology and astronomy.

The Jantar Mantar was designed to perform various astronomical observations, including measuring the distance to the stars, observing the movement of planets, and predicting eclipses.

Aryabhata, a renowned ancient Indian astronomer and mathematician, proposed the heliocentric model of the solar system, where the Earth and other planets revolve around the Sun.

Ancient Indian sailors primarily determined their latitude by measuring the angle between the Sun and the horizon using instruments like the astrolabe or the quadrant.

Aryabhata, a prominent ancient Indian astronomer, was the first to propose the concept of the precession of the equinoxes, the gradual shift in the position of the equinoxes over time.

The astronomical observatory at Nalanda University served multiple purposes, including observing the movement of planets, predicting eclipses, and training astronomers and astrologers.

The Surya Siddhanta provides detailed descriptions of various astronomical instruments, such as the gnomon, the astrolabe, and the quadrant, and their applications in astronomy and navigation.

Ancient Indian sailors did not have a reliable method to determine their longitude accurately during long sea voyages.

Aryabhata developed a method for calculating the circumference of the Earth using trigonometry and astronomical observations.

The astrolabe was a versatile instrument used in ancient Indian navigation for measuring the altitude of celestial bodies, determining the time of day, and calculating the distance to the stars.

Aryabhata was the first ancient Indian astronomer to propose the idea that the Earth rotates on its axis, a concept that was later adopted by astronomers worldwide.