Bhagaṇa-yantra

 was an instrument used by early Indian astronomers.

It is one of Lalla's 12 instruments of astronomy. and could be used to measure bhagaṇa.

Lalla described it as a sort of cakra-yantra (circle instrument) with a modified graduation based on the oblique ascensions of the Signs. It could then be used to find the degrees that the Sun had travelled after daybreak.