The colours are clearly visible but are not as well defined as in a rainbow.
Even when the sun itself is blocked out the glare from the cirrus can be very strong, so eye protection is often needed.
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The smooth cirrus background made this strong halo stand out.
It shows very well how the brightness drops off gradually outside the halo.
The brightness falls off very rapidly at the inner edge where the sky is darker than outside the halo.
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