Solar and Lunar Eclipse - size of moon

[samona]

If during a solar eclipse the moon tapers one moon diameter, wouldn't a lunar eclipse taper one Earth diameter?

 

[davenn]

hi samona

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

Dave

 

[samona]

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?