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High Sun Halos imaged by Laurent Laveder (site, Sky Photos ) in France. ©Laurent Laveder, shown with permission.

The inner circular halo is the familiar 22 degree halo.

Surrounding it and touching at top and bottom is a circumscribed halo. At low sun there are two tangent arcs. As the sun climbs they join to form the circumscribed halo, initially a drooping oval shape. At higher sun the oval tightens and eventually it is almost circular. When nearly circular It is often mistaken for the less colourful 22 degree halo.