Solar eclipse of August 21, 2017

On Monday, August 21, 2017, a total solar eclipse will be visible in totality within a band across the entire contiguous United States; it will only be visible in other countries as a partial eclipse.The last time a total solar eclipse was visible across the entire contiguous United States was during the June 8, 1918 eclipse.   

A¬†solar eclipse¬†occurs when the¬†Moon¬†passes between¬†Earth¬†and the¬†Sun, thereby totally or partly obscuring the image of the sun for a viewer on Earth. A total solar eclipse occurs when the moon’s¬†apparent diameter¬†is larger than the sun’s, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth’s surface, with the partial solar eclipse visible over a surrounding region thousands of kilometers wide. ¬† ¬†¬†

This eclipse is the 22nd of the 77 members of Saros series 145, which also produced the solar eclipse of August 11, 1999. Members of this series are increasing in duration. The longest eclipse in this series will occur on June 25, 2522 and last for 7 minutes and 12 seconds.     

Not since the February 1979 eclipse has a total eclipse been visible from the mainland United States.The path of totality will touch 14 states, though a partial eclipse will be visible in many more states. The event will begin on the Oregon coast as a partial eclipse at 9:06 a.m. PDT on August 21, and will end later that day as a partial eclipse along the South Carolina coast at about 4:06 p.m.   

There are expected to be logistical issues with the influx of visitors, especially for smaller communities.There have also been issues with counterfeit eclipse glasses being sold.

Future total solar eclipses will cross the United States in¬†April 2024¬†(12 states) and¬†August 2045¬†(10 states), and annular solar eclipses ‚ÄĒ meaning the apparent size of the Moon is smaller than that of the Sun ‚ÄĒ will occur in¬†October 2023¬†(9 states) and¬†June 2048¬†(9 states). ¬† ¬† ¬†¬†

Visibility      

The total eclipse will have a¬†magnitude¬†of 1.0306 and will be visible within a narrow corridor 70 miles (110¬†km) crossing fourteen states of the contiguous¬†United States: Oregon, Idaho, Wyoming, Montana, Iowa, Kansas, Nebraska, Missouri, Illinois, Kentucky, Tennessee, Georgia, North Carolina, and South Carolina.¬†It will be first seen from land in the US shortly after 10:15¬†a.m.¬†PDT¬†at Oregon’s Pacific coast, and then it will progress eastward through¬†Salem, Oregon,¬†Casper, Wyoming,¬†Lincoln, Nebraska,¬†Kansas City, Missouri,¬†St. Louis, Missouri,¬†Hopkinsville, Kentucky,¬†Nashville, Tennessee,¬†Columbia, South Carolina, and finally¬†Charleston, South Carolina. (A partial eclipse will be seen for a greater time period, beginning shortly after 9:00¬†a.m. PDT along the Pacific Coast of Oregon.) This eclipse is unprecedented in modern times in that 12.2 million people reside in the path of totality, and 88 million live within a day’s driving distance. ¬†

The longest duration of totality will be 2 minutes 41.6 seconds at about¬†37¬į35‚Ä≤0‚Ä≥N¬†89¬į7‚Ä≤0‚Ä≥W¬†in¬†Giant City State Park, just south of¬†Carbondale, Illinois, and the greatest extent (width) will be at¬†36¬į58‚Ä≤0‚Ä≥N¬†87¬į40‚Ä≤18‚Ä≥W¬†near the village of¬†Cerulean, Kentucky, located in between¬†Hopkinsville¬†and¬†Princeton.[12]¬†This will be the first total solar eclipse visible from the¬†Southeastern United States¬†since the¬†solar eclipse of March 7, 1970, which was only visible from¬†Florida. ¬† ¬†¬†

A partial solar eclipse will be seen from the much broader path of the¬†Moon‘s¬†penumbra, including all of¬†North America, northern¬†South America,¬†Western Europe, and some of¬†Africa¬†and north-east of¬†Asia.