https://www.youtube.com/watch?v=2HEYdjQ0YFI
Here is an easy to understand animation that explains the science of Earth’s seasons. The video above illustrates the Northern hemisphere, and the one below, the Soutern hemisphere.
https://www.youtube.com/watch?v=GSHyqk99tM8
From Dr James O’Donoghue:
The length of time we’re exposed to Sun each day, combined with the Sun’s angle in the sky (high angles = high intensities), lead to the seasons. My aim here was to make a visual of this fundamental concept in a single frame. Hope this helps you understand seasons in a new way.