Sunday, August 20, 2017

Total solar eclipse 21 August

What determines when we have an eclipse?
Why are eclipses rare? The moon's orbit wobbles.
Sometimes the moon's shadow is too high above the Earth. Sometimes it is too low. Other times, it is just right.

During the solar eclipse on August 21, 2017, the Moon's shadow will pass over all of North America. The path of the umbra, where the eclipse is total, stretches from Salem, Oregon to Charleston, South Carolina.
This will be the first total solar eclipse visible in the contiguous United States in 38 years.

During those brief moments when the moon completely blocks the sun’s bright face for 2 + minutes, day will turn into night, making visible the otherwise hidden solar corona, the sun’s outer atmosphere. Bright stars and planets will become visible as well.
This is truly one of nature’s most awesome sights.

The eclipse provides a unique opportunity to study the sun, Earth, moon and their interaction because of the eclipse’s long path over land coast to coast.
Scientists will be able to take ground-based and airborne observations over a period of an hour and a half to complement the wealth of data provided by NASA assets.
2017 Total Solar Eclipse - Ways to Watch

The geography of the great solar eclipse of July 14 1748, exhibiting an accurate map of all parts of the Earth in which it will be visible, with the North Pole, according to the latest discoveries 
other map of the solar eclipse in 1748

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