It wasn't raining;
it wasn't even misty:
when this appeared above
Tysoe Hill; but it was only really
visible through my sunglasses:
so that's how this was taken!

I'm told that the pink tones of the rainbow come
courtesy of the sun's low position near the horizon:
which makes the sunlight travel a longer path, and
scatters the green and blue wavelengths,
leaving behind a rosy tinge.