Jala Yantra is used for both measuring time and determining the positions of celestial bodies.

Jala Yantra consists of a large circular vessel, a small float with a pointer, and water.

Jala Yantra measures time by observing the movement of the float and the pointer.

Jala Yantra determines the positions of celestial bodies by observing the position of the float and the pointer.

The North Star is used to align the pointer, determine the time, and determine the positions of celestial bodies in Jala Yantra.

Jala Yantra is more accurate, easier to use, and more portable than other astronomical instruments.

Jala Yantra was first invented in the 5th century BC.

Jala Yantra was invented by Varahamihira.

Jala Yantra was first used in India.

Jala Yantra is very accurate, easy to use, and portable. It has no limitations.

Jala Yantra is not used today.

Jala Yantra is very accurate, easy to use, and portable. It is not used today because there are more advanced astronomical instruments available.

Telescopes, microscopes, and spectrometers are some of the modern astronomical instruments that have replaced Jala Yantra.

The invention of modern astronomical instruments has made it easier to study astronomy by providing astronomers with more powerful and accurate tools.

The future prospects for the study of astronomy include the discovery of new planets and galaxies, the study of black holes and other exotic objects, and the search for extraterrestrial life.