Solar eclipse of August 21, 2017
The solar eclipse of August 21, 2017, dubbed the "Great American Eclipse" by some media, was a total solar eclipse visible within a band that spanned the contiguous United States from the Pacific to the Atlantic coasts. It was also visible as a partial solar eclipse from as far north as Nunavut in northern Canada to as far south as northern South America. In northwestern Europe and Africa, it was partially visible in the late evening. In northeastern Asia, it was partially visible at sunrise.
Totality from Madras, Oregon
Solar eclipse and star system Regulus (upper left) viewed from Cullowhee, North Carolina
Viewing the eclipse at Oregon State University in Corvallis
Diamond ring effect and some prominences at the end of totality, Polk County Fairgrounds, Rickreall, Oregon
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moon's orbital plane is closest to the plane of Earth's orbit. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured. Unlike a lunar eclipse, which may be viewed from anywhere on the night side of Earth, a solar eclipse can only be viewed from a relatively small area of the world. As such, although total solar eclipses occur somewhere on Earth every 18 months on average, they recur at any given place only once every 360 to 410 years.
A total solar eclipse occurs when the Moon completely covers the Sun's disk, as seen in this solar eclipse. Solar prominences can be seen along the limb (in red) as well as extensively the coronal and partly the radiating coronal streamers.
An annular solar eclipse occurs when the Moon is too far away to completely cover the Sun's disk (October 14, 2023).
During a partial solar eclipse, the Moon blocks only part of the Sun's disk (October 25, 2022).
Partial and annular phases of the solar eclipse of May 20, 2012