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TOTAL- SO-13ECLI?SE AUGUST 2 1 , 201 7 YOUR COM PLETE GUIDE WHAT IS A SOLAR ECLIPSE? MOON WOBBLE We don't see an eclipse every time the moon orbits the Earth due to wobbles in the moon's orbit. A solar eclipse only occurs when the plane of the moon's orbit is at just the right angle to cast a PARTIAL ECLIPSE A solar eclipse occurs when the moon passes TOTAL ECLIPSE between the Earth and the un. Locations the Earth in the center of the moon's shadow, or umbra, experience a total solar eclipse. Locations in the outer edge's of the moon's shadow on Earth. SUN МOON EARTH shadow, or penumbra, experience a partial solar eclipse. The point at which the moon completely blocks the sun is known as the totality. UMBRA PENUMBRA MAGNITUDE MOON ORBIT EARTH ORBIT The fraction of the sun's diameter blocked by the moon is known as the eclipse magnitude. The fraction of the sun's area blocked by the moon is known as the eclipse obscuration. PARTIAL ТОTAL PARTIAL WHERE CAN YOU SEE IT? On August 21, 2017, everyone in the United States will be able to see at least a partial eclipse, weather permitting. Anyone in the path of totality. the route made by the umbra as the moon orbits the Earth, will see a total eclipse. The path will move southeast across the continental United States from Oregon to South Carolina. SALEM, OR (PDT) 50% OBSCURATION: 100% START: 9:05 AM MAX.: 10:18 AM END: 11:37 AM 60% CASPER, WY (MDT) OBSCURATION: 100% CHICAGO, IL (CDT) START: 10:22 AM OBSCURATION: 86.6% MAX: 11:43 AM END: 1:09 PM START: 11:54 AM 70% MAX: 1:19 PM END: 2:42 PM 80% KANSAS CITY, MO (CDT) OBSCURATION: 100% NEW YORK, NY (EDT) START: 11:41 AM OBSCURATION: 71.5% START: 1:23 PM MAX: 2:44 PM МАX: 1:08 РМ 90% END: 2:35 PM END: 4 PM DENVER, CO (MDT) LOS ANGELES, CA (PDT) OBSCURATION: 62.2% OBSCURATION: 92.3% START: 10:23 AM MAX: 11:47 AM 100% START: 9:05 AM MAX.: 10:21 AM END: 1:14 PM CHARLESTON, SC (EDT) END: 11:44 AM OBSCURATION: 100% DALLAS, TX (CDT) START: 1:16 PM OBSCURATION: 75.5% 90% MAX: 2:47 PM START: 11:40 AM END: 4:09 PM NASHVILLE, TN (CDT) MAX: 1:09 PM END: 2:39 PM OBSCURATION: 100% START: 11:58 AM МАX: 1:28 PМ END: 2:54 PM 70% 80% 60% HOW CAN YOU SEE IT? To view the solar eclipse, you only need to go outside at the correct time. However, it is dangerous to look directly at the sun, even during an eclipse. The sun's ultraviolet rays can damage your eyes, in some cases causing permanent vision problems. X INSTEAD, Make your own pinhole viewer! cover your eyes with special-purpose solar eclipse glasses -regular sunglasses will not protect your eyes. Place a strip of white cardboard in the bottom of an empty cereal box. Cut squares at the ends of the top of the closed box. Tape the top shut. Cover one of the squares in heavy-duty OR... foil. Use a thumbtack to poke a hole in the foil. The light will stream through the pinhole and create a safe-to-watch image of the eclipse on the white cardboard strip inside the box. WHY SHOULD YOU WATCH IT? Watching a total solar eclipse makes you a part of history! Check out these important eclipses of the past. Does gravity bend starlight? Definitely, according to observations made during A record of a solar eclipse May 3 Feb. 26 inscribed in a tortoiseshell Nov. 30 this solar eclipse, the first in 1302 B.C. helped NASA scientists find that days have since lengthened by 3340 В.С. 1715 successful test of Albert 1979 England Einstein's general theory of relativity. Ireland USA .047 seconds. Symbols inside the Loughcrew Cairn L Megalithic Monument showing the sun, moon, and horizon might May 29 1919 June 5 You probably know him for his eponymous comet, but Edmond Halley also Although a total solar eclipse is visible 1302 В.C. somewhere on Earth every 18 months or so, it's been 38 years since the contiguous United States got a show. made other astronomical China Príncipe predictions, like the date of this solar eclipse. and Brazil be the earliest known record of a solar eclipse. * All dates are according to the modern, Gregorian calendar, and may have been recorded differently at the time of the event. World Science Festival SOURCES: NASA, THE NEW YORK TIMES, THE GUARDIAN, WIRED, NASA GODDARD MEDIA STUDIOS, JET PROPULSION LABORATORY


shared by jrossman on Aug 23
Whether it’s aurora borealis, horizon-spanning rainbows, or lightning storms, nature knows how to put on a good show. On August 21, 2017, everyone in the United States will get a chance to witness o...


Laura Dattaro


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