Yantras, which are geometric diagrams or symbolic representations, were commonly used in ancient India for various astronomical observations, including comet studies.

The Nakshatra Yantra is specifically designed for observing and studying constellations, which are groups of stars that form recognizable patterns in the night sky.

The Jyotisha Yantra is primarily used for studying the paths and trajectories of comets, allowing astronomers to track their movements across the sky.

The Koti Yantra is specifically designed to measure angular distances between celestial bodies, making it useful for comet observations and determining their positions in the sky.

The Phalaka Yantra is specifically designed for observing comets and tracking their movements across the sky, making it a valuable tool for cometary studies.

The Ghati Yantra is primarily used for measuring time based on the Sun's position, making it useful for determining the duration of day and night.

The Dhruva Yantra is specifically designed for observing and studying the Polar Star, which is a fixed point in the northern sky.

The Yantra Raj Yantra is specifically designed to measure the altitude of celestial objects, allowing astronomers to determine their positions in the sky.

The Chakra Yantra is specifically designed for predicting the occurrence of eclipses, both solar and lunar.

The Dhruva Yantra is specifically designed for determining the direction of true north based on the position of the Pole Star.

The Niryana Yantra is primarily used for studying the transits of planets across the Sun or other celestial bodies.

The Koti Yantra is specifically designed to measure angular distances between celestial bodies, making it useful for comet observations and determining their positions in the sky.

The Phalaka Yantra is specifically designed for observing comets and tracking their movements across the sky, making it a valuable tool for cometary studies.

The Ghati Yantra is primarily used for measuring time based on the Sun's position, making it useful for determining the duration of day and night.

The Dhruva Yantra is specifically designed for observing and studying the Polar Star, which is a fixed point in the northern sky.