What line of latitude is the northernmost point on earth that receives direct light from the sun?

The Tropic of Cancer, which is 23.5 degrees north latitude, has an angle of insolation (incoming solar radiation) of a full 90 degrees, meaning that it receives the most rays of sunlight on the summer solstice. There is no other place that receives more rays or equal rays than this on the earth during this time, because the Tropic of Cancer is only in the northern half of the World. Extra stuff On the winter solstice, the Tropic of Capricorn, 23.5 degrees south latitude, receives the most rays. on the Autumnal and Vernal equinoxes, the equator (O degrees) gets the most rays.