Here be Unicorns
Moonrise
Photographer Colin Prior, who took this photograph says: I am fascinated by the fleeting nature of the optical phenomena I observe outdoors, such as rainbows, the Aurora borealis (northern lights) or an eclipse.
During my time in wild places, I have been privileged to witness some great rarities — including a white rainbow, the Earth Shadow, a Brockenspectre, the green flash of a setting sun and the Fata Morgana (a mirage) in the Arctic Circle. Each of these phenomena presents their own
unique photographic challenges and for a photographer, require an
understanding of the factors, which create them.
Rainbows are coloured arcs with a radius of 42 degrees around the antisolar point that appear directly opposite the sun. A fainter secondary arc can occur at 51 degrees and when both primary and secondary are present we have a ‘double rainbow.’ Viewed from an aircraft, a rainbow can inscribe a complete circle not visible at ground level. Rainbows can be found in
unexpected places such as waterfalls or geysers. At the beach we can see ‘surf bows’ and there is a ‘marine bow’ formed from the prow of a ship. Whether it is formed in the spray from your garden hose held at arms length, or in a sheet of rain a few miles away, the angular size of a bow remains the same.
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