Why is the weather at the equator hot all year round?

The English name "equator" comes from Latin, which means "equal division". This is what the equator does. It divides the earth into northern and southern hemispheres. It is an imaginary line that circles the Earth between the North and South Poles.

The imaginary lines that circle the Earth parallel to the equator are called "lines of latitude." The equator is the zero degree latitude, and the latitudes above and below it are used to measure the latitude of various points on the earth's surface. These latitude lines divide the earth into several zones, starting from the north, followed by the Arctic Circle, the North Temperate Zone, the Tropics, the South Temperate Zone and the Antarctic Circle. The tropics are the equatorial zone, including the area from 23 degrees north latitude to 23 degrees south latitude. In this area, the sun shines vertically, so the weather is always hot.

Why is this? As we all know, the Earth's axis is oblique to its orbit around the Sun. Therefore, the equator is also oblique to this orbit, and the angle of this oblique intersection is exactly 23 degrees. Therefore, as the Earth orbits the Sun, the direct light from the Sun sometimes falls north of the equator, sometimes falls on the equator, and sometimes falls south of the equator. However, the sun's direct light does not go beyond 23 degrees on either side of the equator.

This shows that the equatorial zone is the only place on the earth that is vertically illuminated by sunlight. Because the area near the equator is exposed to direct sunlight year-round, the weather there is always particularly hot.