Here's how it works:
* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt is the reason we have seasons.
* Sub-Solar Point: The sub-solar point is the point on Earth's surface where the sun is directly overhead, making the sun's rays hit the surface at a 90-degree angle.
* Movement: The sub-solar point moves throughout the year, tracing a path between the Tropics of Cancer (23.5 degrees North) and Capricorn (23.5 degrees South). This movement is caused by the Earth's orbit around the sun.
Therefore, the most vertical ray of the sun is always located at the sub-solar point, which is constantly shifting throughout the year.
