Only when the moon covers the sun in a total eclipse can its halo be seen. This is the corona, a mystery to astronomers, who only get a glimpse of it for a few minutes during totality. The dot to the lower left is the star Regulus, in the constellation Leo, suddenly visible while the sun is eclipsed.
Heise Hot Springs, Idaho
21 August 2017
EOS 6D on Televue-85, 480 mm f/5.6
HDR composite of 8 exposures