They fall on one spot somewhere on the Tropic of Cancer,
for just a moment, once a year, near the 21st of June.
It is called the Tropic of Cancer.
the ocean
You must mean: "When the tropic of Cancer recieves the rays of the sun at a 90 degrees angle". We call that the Equinox.
the Tropic of Cancer
The sun is directly over the Tropic of Cancer at the time of the June solstice, and it is directly over the Tropic of Capricorn at the time of the December solstice.
Rays Between The Tropic Of Cancer And The Tropic Of Capricorn. - Mariah Dominic
tropic of cancer
When the sun is above the Tropic of Cancer, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere.
the furthest north the suns rays hit perpendicular to the earth
That depends on the time of year as a result of the Earth's tilt. The rays are strongest between the Tropic of Cancer and the Tropic of Capricorn, Cancer at the Northern hemisphere Midsummer (June) and Capricorn at the Southern hemisphere Midsummer (December).
From the Tropic of Cancer (23.45 degrees north) to the Tropic of Capricorn (23.45 degrees south).
Tropic of cancer