Equator: An imaginary line of latitude that divides the Earth into northern and southern hemispheres.
Tropic of Cancer: A line of latitude located at about 23.5 degrees north, marking the northernmost point where the sun appears directly overhead during summer solstice.
Tropic of Capricorn: A line of latitude located at about 23.5 degrees south, marking the southernmost point where the sun appears directly overhead during summer solstice.