Lunar Eclipse 20070303
In Class:
Do the following in the order given.
Read the Yahoo News story on the eclipse. After reading, sketch how the Earth, Moon, and Sun are positioned with respect to each other during a lunar eclipse. Include in your sketch the position of the atmosphere of the Earth [wikipedia.org…Earth’s_atmosphere]. Note that 100.0000% of the Earth’s atmosphere is located within 100 km of the Earth’s surface.
What is refraction [§11-14 and TPC …/waves/U10L3b and wikipedia.org…Refraction] and what causes it in this instance? Sketch at least two rays of sunlight that show this refraction.
Why is the Moon red during the eclipse? Explain in terms of dispersion [§24-3 and §24-12 andTPC …/light/U12L2a and TPC…/light/U12L2f and wikipedia.org…Dispersion].
Read NASA (as it relates to 3/3 lunar eclipse).
Extra Credit:
Due Monday, March 5, Before 7:30 a.m.
Not accepted late.
Redo your Earth, Moon, and Sun [EMS] sketch. Label each distance and diameter with values found from reliable sources. You must include a bibliography, in the form of a table, of these values with three columns: description of value, value, source(s). The sketch should show why the moon is red during the eclipse and where the rest of the refracted sunlight goes. Colored pen(cils) would be helpful in this illustration.
What are the penumbra and umbra? How are these important to what you will see when you view the eclipse? Draw a sketch showing how the umbra and penumbra are defined. Calculate the angles of the lines, with respect to the axis that passes through the centers of the EMS, that define the umbra and penumbra. Use the values you found for the first part of this assignment in these calculations. Show all work.
Determine the radii of the umbra and penumbra circles, drawn perpendicular to the EMS axis, formed at a distance equal to that of the moon from the Earth. What percent of the areas of each of these circles will the Moon occupy?
Assume that you have a strip of paper that is 10.00 m long and of adequate width. Determine the positions and sizes of the Earth, Moon, and Sun in order to maximize the use of this strip. Determine the width of paper required.
All calculations must be shown clearly and completely, following the guidelines used on quizzes.
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