A total solar eclipse can occur every 18 months and last for 7 and half hours. Assuming that full eclipse occurs and considering that the sun, moon and earth are a disc,
1. Calculate the energy received by the earth from the Sun.
2. Calculate the energy received by the earth when full eclipse occurs.
Compare the average global temperature for case 1 and 2 above. (Albedo = reflectivity; earth = 0.37, moon = 0.12).
According to Kirchoff’s law and radiation shield theory, eclipse does reduce the global temperature to a certain degree.
发表于 6-4-2011 03:27 PM
变色卡
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