Which latitude line defines the northern limit of the tropics?

The Tropic of Cancer is the latitude line that defines the northern limit of the tropics, located at approximately 23.5 degrees North. This line marks the point at which the sun is directly overhead during the summer solstice in the Northern Hemisphere, which occurs around June 21 each year. At this latitude, the characteristics of a tropical climate, such as high temperatures and significant rainfall, are most prevalent.

The other options do not define the northern limit of the tropics: the Equator represents the midpoint latitude at 0 degrees and divides the Earth into the Northern and Southern Hemispheres; the Tropic of Capricorn, located at approximately 23.5 degrees South, marks the southern limit of the tropics; and the Arctic Circle, found at approximately 66.5 degrees North, establishes the region where the sun does not set during the summer solstice, but it lies well outside the tropics altogether.