Solar image: August 2, 2017 Questar 1/10sec Lunar image: July 31, 2017 Questar 1/6sec
Solar eclipse on August 21, 2017
On Monday, August 21, the sun will be eclipsed by the Moon. As the Moon is seen to move in front of and across the face of the Sun, it will cast a shadow on the Earth. This shadow will be about 70 miles wide and will sweep across the United States from Oregon to South Carolina. The track of the shadow is called the Path of Totality.
Anyone inside this path will be able to see a total eclipse of the Sun, if the skies are clear. Witnessing a total solar eclipse is described as an awe-inspiring experience – the sky darkens to night as the Sun is covered by the Moon, stars and planets become visible, the temperature drops, animals and plants react as if it were night, and the Sun’s outer atmosphere (corona) becomes visible in the sky for a few minutes. At the start and end of totality a string of beads form around the limb of the Moon (Bailey’s Beads are created when the bright light of the Sun’s surface streams through the valleys along the Moon’s edge), and a spectacular diamond ring is seen signaling the beginning and ending of totality as the central bead flares out.
If you are not inside the path of totality, none of these phenomena are visible. However, in a wider band on both sides of the path of totality, a partial eclipse can be seen. In the Shenandoah County region about 86% of the Sun’s surface will be covered at maximum eclipse. The eclipse will begin here around 1:14 PM EDT when the leading edge of the Moon first blocks a bit of the Sun’s surface from view. More and more of the Sun’s surface will be blocked until around 2:40 PM EDT the maximum of 86% is reached. At this time the Sun will stand about 60 degrees above the southwestern horizon. Thereafter, the Moon will be uncovering more of the Sun’s surface again until the partial eclipse ends around 4:00 PM EDT.
It is never safe to look directly at the Sun, either with the unaided eye or through binoculars or telescopes without proper solar filters. There are various sources that can be found on the internet that can provide safe, tested solar filters for viewing the Sun. These are not regular sunglasses! There are also descriptions available for making a pinhole projection device for viewing the sun. Make certain you take the proper precautions if you plan to look at the eclipse. There is no more danger in being outside during a solar eclipse than on any other sunny day, just don’t stare at the Sun!
If you plan to photograph the eclipse, a safe, tested solar filter will be necessary for your camera. Such a filter should be used for all partial phases. The filter is not needed during totality (if you are inside the path of totality). Filters can be ordered online from such places as: http://www.daystarfilters.com or any of the sources listed on the NASA eclipse site (see below).
For anyone wanting more information about the eclipse, the NASA webpage at https://eclipse.gsfc.nasa.gov/solar.html is a good place to start or any of the articles that have appeared recently in various credible news media. There is a cool interactive map of the path of totality at: https://www.washingtonpost.com/graphics/national/mapping-the-2017-eclipse/?utm_term=.41b823a625a3
I encourage anyone who can do so to travel to a spot inside the path of totality for a marvelous celestial event. Wherever you are on August 21, I wish you clear skies!






















