Sundog Polarisation

In this example of a left sundog it is at a fairly high altitude (20 degrees) so the colour band is noticeably tilted away from the sun. On this occasion the cloud was moving from right to left and the cloud motion happened to be similar to the sundog shift in the left pair . In the right pair the sundog motion is in the opposite direction so the effect is more obvious.

Horizontal polarisation shows the rays from the sundog closest to the sun, which is off to the right. Switching to vertical polarisation shows the outer one so there is a leftward shift. The orientation of the polariser is shown at the bottom left of each image.

Click here to change angle of polariser

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Canon EOS 400D   24th July 2007
Wiltshire, England

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