Solar Eclipse Guide 2019: When, Where & How to See Them

"A solar eclipse occurs when the disk of the moon appears to cross in front of the disk of the sun. A total solar eclipse — like the one that crossed the U.S. on Aug. 21, 2017..."

This was a great solar eclipse to observe. I really enjoyed using my telescope with white-light solar filer, 90-mm refractor to view the event. Solar eclipses measured in the 1880s showed the Moon is slowly receding from Earth and the Earth is slowing down too, thus the length of day is increasing. Charles Darwin's son, George Darwin noted this and developed the fission theory for the origin of the Moon.


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