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From: SSHS KPHOX <kphox@MAIL.CCSD.K12.CO.US>The shadow itself is approximately 2.5 moon diameters at the Moon's distance. I think your statement is correct.
This is unclear but I think that what he is saying is something like this:
If the diameter of the earth's shadow were measured at the position of the
moon during a lunar eclipse, it would be smaller than the diameter of the
earth by a distance equal to one moon diameter. Thus the size of the
earth's shadow at the moon's position will cover the entire moon.
Having said that I need to say that Hewitt's language is very unclear. IThere's a diagram that I couldn't begin to reproduce here. This description is also in the seventh and ninth editions.
don't have that edition to see the page around it or the context.