Describe the measurement of Earth’s shadow (umbra) radius during
total lunar eclipse .
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The angular size of the sun (½ degree) is almost exactly the angular size of the moon. So the penumbra of the Earth's shadow spreads out one Moon diameter on either side of the umbra. So the total diameter of the Earth's shadow is the size of the umbra + two Moon diameters, or 2.8 + 2 = 4.8 Moon diameters.
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