The Earth's seasons arise from the 23.5-degree tilt of Earth's daily spin axis as it
Chapter 0, Problem 6(choose chapter or problem)
The Earth's seasons arise from the 23.5-degree tilt of Earth's daily spin axis as it orbits the Sun. When Earth is at the position shown on the right in the sketch below (not to scale), the Northern Hemisphere tilts toward the Sun, and sunlight striking it is strong (more rays per area). Sunlight striking Southern Hemisphere is weak (fewer rays per area). Days in the north are warmer, and daylight is longer. You can see this by imagining Earth making its complete daily 24-hour spin. Do two things on the sketch: (i) Shade the part of Earth in nighttime darkness for all positions, as is already done in the left position. (ii) Label each position with the proper month-March, June, September, or December.
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