EA_The June and December Solstices, pg27(1)

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Virginia Wesleyan College *

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Geography

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Oct 30, 2023

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Environmental Analysis The June and December Solstices The amount of solar energy received in a particular location during a day is mostly a consequence of the number of hours of Sun exposure and the intensity of radiation. In turn, that intensity is largely determined by the Sun angle—the height of the Sun above the horizon. (Cloud cover also plays a role.) Data: Solstices Activities Refer to Table 1-3 . 1. Should the equator or 30° N receive more solar energy on the June solstice? Why? 2. The North Pole has 24 hours of daylight on the June solstice, whereas the equator has only about 12. What helps explain why the North Pole is so much colder on that day? 3. In terms of Sun exposure, why is it “winter” at 30° S on the June solstice? Go to suncalc.org . and enter your location in the search box. Find the solar altitude (in degrees above the horizon) for your city on the June solstice and on the December solstice. Clicking on the date and time boxes allows you to change them. 4. What is the highest (noon) solar altitude in your city on each of those days? 5. What is the difference (in degrees) between the noon solar altitudes on those two days? 6. How does the difference in solar altitude relate to the difference in the Sun’s declination (shown in Figure 1-25 ) on those days? 7. How much daylight does your city have on the June solstice and December solstice? 8. Repeat Activity 7 for Anchorage, Alaska, and Key West, Florida. (If you live in either city, use Omaha, Nebraska, as your third city.) 9. Contrast and explain the differences in daylight on these two days in all three cities. Clicking on the time box allows you to “Start animation…” to see the Sun’s patha cross the sky from dawn to dusk.
10. Is the sun’s noon location to the north of Key West on the solstices? What about for the Panama Canal? Explain why the answers are different.
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