1. Earth's Tilt:
* Earth is tilted on its axis at approximately 23.5 degrees.
* This tilt means that different parts of the Earth receive varying amounts of direct sunlight throughout the year.
2. Earth's Revolution:
* As Earth revolves around the sun, the Northern Hemisphere is tilted towards the sun for half of the year, and the Southern Hemisphere is tilted towards the sun for the other half.
* When the Northern Hemisphere is tilted towards the sun, it experiences summer, while the Southern Hemisphere experiences winter. The opposite occurs during the other half of the year.
3. Direct Sunlight:
* The hemisphere tilted towards the sun receives more direct sunlight, resulting in longer days and warmer temperatures. This is because the sunlight hits the Earth at a more direct angle, concentrating its energy.
* The hemisphere tilted away from the sun receives less direct sunlight, leading to shorter days and cooler temperatures.
4. The Equinoxes and Solstices:
* The equinoxes (spring and autumn) occur when both hemispheres receive an equal amount of sunlight. Day and night are roughly equal in length.
* The solstices (summer and winter) occur when one hemisphere is tilted most directly towards the sun (summer) and the other is tilted furthest away (winter).
In summary: Earth's tilt causes different parts of the Earth to receive varying amounts of direct sunlight throughout the year. Earth's revolution ensures that this pattern of sunlight distribution changes over the course of a year, resulting in the four seasons.
