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Why We Have Seasons Beginning of Paper Seasons are produced by the inclination of the earth's axis of rotation, with the yearly revolution around the sun. During the earth's yearly revolution around the sun, the northern and southern hemispheres alternate their incline towards and away from the sun. This unequal heating .... Middle of Paper .... the vernal equinox the sun hits the northern surface at an angle instead of hitting it directly. By hitting the earth's surface at an angle there is not as much radiation warming the surface. As the earth rotates and the sun moves further north the temperature increases and the weather turns warmer. During the three months of spring the sun continues to move north and warming the earth more efficiently. At around June 21st the sun is directly facing the tropic of cancer. At this time the movement north comes to a halt and the earth's s .... 773 words | 3 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95