Here's why:
* Earth's Tilt: The Earth is tilted on its axis at approximately 23.5 degrees. This tilt causes the Sun's apparent position in the sky to vary throughout the year.
* Solar Declination: The Sun's declination is the angular distance of the Sun north or south of the celestial equator. This changes throughout the year, reaching a maximum of +23.5 degrees (summer solstice) and a minimum of -23.5 degrees (winter solstice).
* Equator's Position: The equator is at 0 degrees latitude, meaning it's directly in the middle of the Earth's sphere.
* Result: Due to the Earth's tilt, the Sun will only be directly overhead at the equator twice a year, during the spring and autumn equinoxes.
However:
* People living within the tropical zone, which extends approximately 23.5 degrees north and south of the equator, will experience the Sun directly overhead at least once a year.
So, while the Sun will be high in the sky for people at the equator, it won't be directly overhead every day of the year.
