A lunar eclipse occurs when the Moon moves through the Earth's shadow, thereby blocking sunlight from falling on the Moon. In order for there to be a total eclipse, the Moon must go through the umbra of the Earth's shadow. If the Moon partly goes through the umbra, there will be a partial eclipse. If the Moon only goes through the penumbra, then the Moon's light is only slightly dimmed, and the eclipse is hardly noticeable here on Earth.
Click here to reach Fred Espenak's eclipse page at the NASA Goddard Space Flight Center, where you can find detailed information about solar eclipses that will occur in the next 100 years.
Click here to reach his primer on lunar eclipses at MrEclipse.com.
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