Want this question answered?
I think that the word you want is perpendicular rays, the rays of sunlight hitting the Earth when the Sun is directly overhead. This point is always within the tropics.
at the poles
The sun rises each year at the South Pole about September 21 and sets each year about March 21. This means six months with no sunsets. The maximum height of the sun above the horizon is only 23.5 degrees, so you could consider it less sun, except that you don't offer a comparison.
summer solstice, or june 21
The seasonal tilting of the Earth away from the Sun, causes the sunlight to strike the Earth at an angle that means the distance travelled is longer and cooling is increased. This means that Winter occurs in the Northern Hemisphere, and Summer in the Southern Hemisphere, and visa versa when the Earth tilts towards the Sun.
LEss than a 45 degree angle
Either the answer will be that they contain more solar energy, it strike's the earth at an angle greater than 90 degrees, or it could be that they spread energy over a larger surface area.
The amount of solar energy that a place receives relates to the angle at which the sun's rays strike earth
23.37 degrees Meaning that the Poles are tilted at 23.37 degrees to the angle at which the Sun's rays strike the Earth.