21 August Total Solar Eclipse In The USA.
On Aug. 21, 2017, people across the United States will see the sun disappear behind the moon, turning daylight into twilight, causing the temperature drop rapidly and revealing massive streamers of light streaking through the sky around the silhouette of the moon. On that day, America will fall under the path of a total solar eclipse. The Great American Total Solar Eclipse will darken skies all the way from Oregon to South Carolina, along a stretch of land about 70 miles (113 kilometres) wide. People who descend upon this “path of totality” for the big event are in for an unforgettable experience. A total solar eclipse occurs when the disk of the moon appears to completely cover the disk of the sun in the sky. The fact that total solar eclipses occur at all is a quirk of cosmic geometry. The moon orbits an average of 239,000 miles (385,000 kilometres) from Earth — just the right distance to seem the same size in the sky as the much-larger sun. However, these heavenly bodies line up only about once every 18 months. Outside the path of totality, skywatchers in the continental U.S. and other nearby areas will see a partial solar eclipse, in which the moon appears to take a bite out of the sun’s disk. Two to five solar eclipses occur each year on average, but total solar eclipses happen just once every 18 months or so. At most, the moon will completely cover the disk of the sun for 2 minutes and 40 seconds. That’s about how long totality will last for observers positioned anywhere along the center of the path of totality. As you move toward the edge of the path, the duration of totality will decrease. People standing at the very edge of the path may observe totality for only a few seconds. The path of totality for the Aug. 21, 2017, total solar eclipse is about 70 miles wide and it passes through Idaho, Wyoming, Nebraska, Kansas, Missouri, Illinois, Kentucky, Tennessee, Georgia, North Carolina and South Carolina.
IMPORTANT NOTICE: Anyone planning to view the total solar eclipse of should get a pair of solar viewing glasses. These protective shades make it possible for observers to look directly at the sun before and after totality. The following four companies sell eclipse glasses that meet the international standard (ISO 12312-2) recommended by NASA, the AAS and other scientific organisations: Rainbow Symphony, American Paper Optics, Thousand Oaks Optical and TSE 17. Sunglasses cannot be used in place of solar viewing glasses.
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