Glories
Small coloured rings around the shadow of your head, seen from a hilltop above fog or an aircraft window.
WhenWhenever you are above mist or cloud with the sun behind youWhereAround the shadow of your own head, on fog, mist or cloud tops
Why it happens
Light scattered straight back towards the sun by tiny water droplets makes a set of coloured rings centred exactly opposite the sun, which is where the shadow of your head falls. Each person sees a glory only around their own shadow.
How to see it
From a ridge above a valley of morning fog, or from a window seat on the shady side of an aircraft flying over a cloud deck. When your whole shadow stretches across the fog with rings around its head, the effect is called a Brocken spectre.
Field note. Aircraft glories are commonest when the sun is low and you are sitting on the side away from it.