storyboard 2
Storyboard Text
- Slide: 1
- However, this is not the case. The Earth is tilted by 23.5 degrees, causing all latitudes to have 23.5 degrees subtracted to them (treating areas on the other side of the world as having negative latitude). As we can see by the position of the equator (red), more of the lighted area (to the left of the yellow) is in the northern hemisphere (above the red) than below the northern hemisphere (below the red). This discrepancy in sunlight causes the seasons. In the diagram, it is summer in the Northern Hemisphere and it is winter in the Southern Hemisphere.
- Slide: 2
- There are two areas on Earth's surface that obey a special relationship with Earth's tilt, called the Arctic (white) and Antarctic (green) circles. Note that when the Earth spins around its axis, neither of these circles ever leaves the lightened or darkened zone that they started in. The only way for these circles to experience the day and night cycle is to wait a year for the Earth's axis to do a relative spin around the Sun.
- Slide: 3
- Twice a year, the Earth's axis lines up with its terminator - the boundary of its lighted area (from the perspective of the Sun). This causes the Northern and Southern hemisphere to be lighted with equal intensity and for an equal duration. This event is called an equinox.
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