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Stargazing Solar and Lunar Eclipse - size of moon

  1. Jun 16, 2012 #1
    If during a solar eclipse the moon tapers one moon diameter, wouldn't a lunar eclipse taper one earth diameter?
     
  2. jcsd
  3. Jun 16, 2012 #2

    davenn

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    hi samona

    what do you mean by tapers one moon diameter ?
    you do realise that the moon is a lot closer to the earth than the sun is ?

    Dave
     
  4. Jun 16, 2012 #3
    I meant the shadow of the moon tapers 1 moon diameter on the earth during a solar eclipse. My physics book says that the earth's shadow on the moon during a lunar eclipse also tapers 1 moon diameter.

    My physics book says that if the moon's shadow tapers 1 moon diameter on the earth during a solar eclipse, then the earth's shadow tapers one moon diameter during a lunar eclipse. Therefore, since the earth's shadow is 2.5 times wider than the moon, if you take into account that the earth's shadow tapers 1 moon diameter than the earth is 3.5(2.5 + 1) times larger than the moon.

    My confusion is that if the moon's shadow tapers 1 moon diameter, why does the earth's shadow also taper 1 moon diameter? Wouldn't the earth's shadow taper one earth diameter?
     
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