Here's why:
* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt causes different parts of the Earth to receive varying amounts of direct sunlight throughout the year.
* Equator's Position: The equator is an imaginary line that circles the Earth at 0 degrees latitude. It's positioned directly in the middle of the Earth, meaning it receives the most direct sunlight year-round.
* Angle of Incidence: The angle at which sunlight hits the Earth's surface determines the intensity of the sunlight. The equator receives sunlight at a close to perpendicular angle (high angle of incidence), resulting in more concentrated sunlight and warmer temperatures.
As you move away from the equator towards the poles, the angle of the sun's rays becomes more oblique, resulting in less direct sunlight and colder temperatures.