Lunar eclipses occur when the Moon passes through the Earth's shadow. This happens only during a full moon, when the Moon is on the far side of the Earth from the Sun. Unlike a solar eclipse, an eclipse of the Moon can be observed from nearly an entire hemisphere. A corona is an aura of plasma that surrounds the sun and other stars. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. The corona forms the "diamond ring" when the eclipse reaches totality, the point in an eclipse when the sun is completely covered. I personally experienced an eclipse, the one many people viewed that happened August 21st. It really was amazing, and I hope you got to see it. I know this is my first project in a while, but I have spent most of my summer at the beach, and not have had time to make projects.
Enjoy!