Question

what is the importance of tropic of cancer...?

Answer 1

the points on the topic of cancer are northern most point where the sun can pass directly overhead ... it is at noon of June 21 of each year when the sun is directly overhead on the Tropic of Cancer ,marking the beginning of Summer in the Northern hemisphere

Answer 2

it divides india into almost two equal parts.
Most favourable climate
Thickly populated area (human resources)