Hallelujah it's raining bows

Just after finishing work with the sun blazing away into the wind, it started to drizzle, with heavy grey cloud moving in.  But the impending downpour was heralded with a magnificent rainbow, a portion of which I have reproduced here.  My wide angle shot came out really well too, and both it and this one show Alexander's Dark Band nicely.  If you have watched the lecture* by Walter Lewin (at MIT) on the laws of refraction that generate rainbows, then you'll know why the dark band appears, and indeed for example, why the colour order of the secondary bow is reversed from the primary bow.

The downpour never arrived, the grey moved on, so I cycled out to Halfords to photograph the labels on bottles of oil to compare, as the final drive on Fidra will need doing in the next thousand or two miles, but I forgot to take my phone, and didn't have any paper to write any notes either.  So I came home again.

A pleasant evening was rounded out with a video chat with lovely BikerBabe.

* More entertaining than simply boning up with Wikipedia!