It's been a very showery summer in Wigton yet this morning's rainbow is the first I've seen for a few months. The reason is to do with why the rainbow is such a low arc. Rainbows are centred around the extra-solar point, which is an imaginary point as far below the ground as the sun is above it. The rainbow is part of a circle around that point. When the sun is very high in the sky in the summer, the extra-solar point is very deep so only a small fraction of the circle is visible. This was what was visible early morning in August. For the past couple of months, so little will have been visible and that explains why I haven't been seeing them.
