#UMPlus - Solar Halo by Alan Dyer
An image doesn't have to be recent to be good. Astronomer Alan Dyer took this photograph from his home on December 19, 2013, showing a splendid solar halo produced by dissolved ice crystals in Earth's atmosphere. These crystals must have a certain size and density, as well as an ideal position of the Sun with respect to the horizon. This is why it is a difficult picture to take, as the perfect conditions have to be met. In this.....
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