The Tropic of Cancer is an imaginary line located at approximately 23.5 degrees north of the equator. It marks the northernmost point where the sun can be directly overhead at noon during the summer solstice, which occurs around June 21 each year. This line plays a significant role in defining the Earth's climate zones, particularly the tropical and subtropical regions. The Tropic of Cancer is one of the five major circles of latitude, alongside the Equator, Tropic of Capricorn, and the Arctic and Antarctic Circles. It influences weather patterns and ecosystems, contributing to the biodiversity found in tropical areas. Understanding this line helps in studying geography, climate, and environmental science.