earth

EQUATOR;
An imaginary line around the equator forming the great circle that is equidistant from the north and south poles OR the equatoris the boundary between the northern and southern hemisphere.The area near the equator both in northern hemisphere and southern hemisphere is called equatorial region.
TROPIC OF CANCER;
A line of latitude about 23 1/2 degrees to the north of the equator.
TROPIC OF CAPRICORN;
A line of latitude  about 23 1/2 to the south of the equator.
Either of two paralles of latitude about 23.5 degrees to the north and the south of the equator representing the points farthest north and south at which the sun can shine directly over headand consitituting the boundairesof the torrid zone or tropics...