Earth's Tilt 1: The Reason for the Seasons

How can it be summer in North America and winter in Australia at the same time?! Many believe Earth’s changing distance from the sun causes the change in the seasons. But that is not the case. Instead, Earth has seasons because our planet’s axis of rotation is tilted at an angle of 23.5 degrees relative to our orbital plane – the plane of Earth’s orbit around the sun. More information at http://k12videos.mit.edu/terms-conditions

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