Here’s a prediction that I know will come true: In the next two years, interest in solar observing will rise dramatically. You probably can guess why. With the great solar eclipse of August 21, 2017, in our future, lots of people will want to prepare by purchasing a filter to view the Sun through.
Most will buy visual solar filters, also known as “white-light” filters. Such an accessory blocks harmful infrared and ultraviolet radiation and reduces the Sun’s visible light to a comfortable level. Such filters let you see sunspots.
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