A Lunar Eclipse occurs when the Earth is between the
Sun and the Moon and the Earth's shadow (or part thereof)
as cast on the Moon. The Moon often takes on a deep
red colour because of light diffucing and refracting
through the Earth's atmosphere.
The shape of the shadow is always part of a circular
arc, thus proving that the Earth must be a sphere,
being the only shape whose shadow is always a circle.
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