One of the more commonly encountered atmospheric optical phenomena, a 22-degree solar halo is caused by ice-crystals (typically associated with light wispy cirrus cloud) refracting the sun's light, giving the effect of a circular ring spectrum like a rainbow, centred on the sun.

I saw this one as I was driving along the side of Loch Lochy as the sun had set below the level of the mountains on the other side of the loch.

After shooting a few stills, I thought it would be interesting to watch the evolution of the halo, as its strength varied, so I made a timelapse video of the clouds moving.

Technical details: Canon EOS550D, 130 frames at 4s intervals for 8.5 minutes.
landscape sky light nature atmospheric-optics clouds colour sun scotland timelapse video sunlight Canon-EOS550D lochaber loch-lochy 22-degree cirrus-cloud optical phenomenon refraction solar-halo spectrum wispy