Bishops ring | Previous Top Next

A whitish ring, centred on the sun or moon, with a slightly bluish tinge on the inside and reddish brown on the outside
Bishop's ring is due to the diffraction of light passing through a cloud of exceeding fine dust of volcanic origin, which is occasionally present in the high atmosphere. The radius of the ring is about 22 degrees.
The colours of a Bishop's ring are not very distinct; they are particularly faint in rings observed around the moon, which usually shows only a pale red fringe.