>>13950110The reason the equator is the hottest part of the planet is because its surface is perpendicular to the sun's rays. At higher latitudes, however, the same amount of solar radiation is spread over a larger area, due to Earth's spherical shape. Even without any tilt, this would result in the equator being warm and the poles being cold.
Because Earth is tilted, different latitudes receive different sun angles throughout the year. During summertime in the Northern Hemisphere, Earth is tilted so that the Northern Hemisphere is angled more directly at the sun. It receives more direct sunlight and is warmer. At the same time, the Southern Hemisphere is angled away from the sun, so it receives less direct sunlight and experiences winter. The axial tilt doesn't change throughout the year, but as Earth travels to the other side of the sun, the opposite hemisphere is angled toward the sun and the seasons change.
