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 is significant in geography and climate, as it helps define the boundaries of the tropics. The Tropic of Cancer passes through several countries, including Mexico, India, and Egypt. It plays a crucial role in understanding climate zones, as areas within the tropics generally experience warm temperatures year-round. The line is also important for navigation and mapping.