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6. Earth's seasons result from the 23.5-degree tilt of Earth's daily spin axis as it orbits the sun. When Earth is at the point 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 the Southern Hemisphere is weak (fewer rays per area). Days in the north are warmer, and day longer. You can see this by imagining Earth making its complete daily 24-hour spin. Do two things on the sketch: (1) Shade the part of Earth in nighttime darkness for all positions, as is already done in the left position. (2) Label each position with the proper month - March, June, September, or December. BE SURE TO DO THE SHADING BEFORE YOU ANSWER THE QUESTIONS BELOW ! a. When Earth is in any of the four positions shown, during one 24-hour spin a location at the equator receives sunlight half the time and is in darkness the other half the time. This means that regions at the equator always get about _ - hours of sunlight and hours of darkness. b. Can you see that in the June position regions farther north have longer daylight hours and shorter nights? Locations north of the Arctic Circle (dotted line in Northern Hemisphere) always face toward the sun as Earth spins, so they get daylight hours a day. c. How many hours of light and darkness are there in June at regions south of the Antarctic Circle (dotted line in Southern Hemisphere)? d. Six months later, when Earth is at the December position, is the situation in the Antarctic the same or is it the reverse? e. Why do South America and Australia enjoy warm weather in December instead of June? CONCEPTUAL PHYSICS 06 Chapter 22 Heat Transfer