For the first time in human history there will be a Total Solar Eclipse on August21,2017
On Aug 21, 2017, people across the different countries will see the sun disappear behind the moon, turning daylight into twilight
A total solar eclipse arises when the convexity of the moon seems to efficiently coat the disk of the sun in the sky. The fact that total solar eclipses occur at all is a quirk of cosmic geometry. The average distance of the Moon is 239,000 miles (385,000 kilometers) from Earth — just the right distance to seem the same size in the sky as the much-larger sun. However, these heavenly bodies lineup together only about once every 18 months.
On Aug 21, 2017, people across the different countries will see the sun disappear behind the moon, turning daylight into twilight, causing the temperature drops rapidly and revealing massive streamers of light streaking through the sky around the silhouette of the moon. The timing of the total solar eclipse and its duration both will depend upon where you are inside the path of totality. 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 near the edge of the path may observe totality for only a few seconds. People in parts of Africa, South America and Europe will be able to see at least a partial eclipse in August, and about 220 million people will be within an hour’s drive of the moon’s dark conical shadow as it moves across the United States, Rao said. The path of totality will average about 100 miles (161 kilometers) in width, and 12 million people are already living within the “fortuitous” path of the eclipse. Making a precise measurement of the sun is difficult, but the August 21 eclipse will offer scientists an opportunity to refine their calculations.
REMEMBER: Looking directly at the sun, even when it is partially covered by the moon, can cause serious eye damage or blindness. Never look at a partial solar eclipse without proper eye protection.