penumbra lunar eclipse

Moon's shadow will cross the penumbra of the Earth and produce the phenomenon of the penumbra Lunar Eclipse. Earth's shadow has two parts, the umbra (darkest part) and penumbra (the less dark surrounding umbra).
Although it eclipses the penumbra, the Moon will pass quite close to the umbra. We will be able to see it look a little on one side sopek.
Because the penumbra shadow effect is almost impossible to see with the naked eye, we can only see the effect when the Moon approaches the umbra

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