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We moved on to a new topic today: seasons. We went through a PowerPoint presentation (posted below) that started off with a diagram of the sun, Earth, moon system — not to scale! Then we added in the Earth’s orbit, its rotation, and also its tilt, which was a new addition to yesterday’s model. Then we discussed how the increasing the angle of incoming sunlight can make it much less powerful. Putting all of this together, the reason for the seasons became obvious. It’s not because of the gods or because of our changing distance from the sun, it’s because of Earth’s tilt.

February 13 – Seasons Notes (pg506).pptx

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