A fencepost blocks the sun so a 22-degree halo can be photographed. 22 degrees refers to the angular measure from the sun to the edge (radius) and can be estimated on the scene by stretching your arm straight and extending your thumb and pinky fingers: your thumb touching the sun and your pinky touching the halo edge. Try it if you ever see a halo or sun-dog (perhelia). If it doesn't match, then it isn't a 22-degree halo.
Location: CA, along Pacific Coast Hwy near San Simeon
Date: January 1997
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© Copyright, Gregory Thompson, inclouds.greg@gmail.com, In the Clouds Photography