A quadrant is a quarter-circle shaped instrument used to measure the altitude of celestial bodies above the horizon.

An astrolabe is a versatile instrument that can be used for measuring the altitude of celestial bodies, determining the time of day, and calculating the position of stars and planets.

A sundial is an instrument that uses the position of the sun to tell the time of day.

An armillary sphere is a model of the universe that demonstrates the motions of the celestial bodies.

An ephemeris is a table that contains the positions of celestial bodies at regular intervals of time.

The Yastiyantra was a simple but effective instrument used to measure the distance between two stars by measuring the angle between them.

The Sanku was a simple vertical rod that was used to measure the altitude of the sun by measuring the length of its shadow.

The Dhruvabhrama Yantra was a versatile instrument that could be used for measuring the altitude of celestial bodies, determining the time of day, and calculating the position of stars and planets.

The Ghati Yantra was a water clock that was used to measure the time of day by measuring the amount of water that flowed out of a container.

The Jala Yantra was a simple instrument that was used to measure the distance between two stars by measuring the angle between them.

The Phalaka Yantra was a flat board that was used to calculate the position of stars and planets by using mathematical calculations.

The Bhugola Yantra was a versatile instrument that could be used for measuring the altitude of celestial bodies, determining the time of day, and calculating the position of stars and planets.

The Kapala Yantra was a hemispherical bowl that was filled with water and used to measure the altitude of the sun by measuring the length of its shadow.

The Dhruva Yantra was a versatile instrument that could be used for measuring the altitude of celestial bodies, determining the time of day, and calculating the position of stars and planets.

The Nadi Yantra was a water clock that was used to measure the time of day by measuring the amount of water that flowed out of a container.