Sunset over the Pentland Firth

Dunnet Head on the far left and the island of Hoy in the Orkneys on the right.
Note the upper and lower clouds moving in almost opposite directions.

Date: 10 July 2012
Number of exposures: 1508
Exposure interval: 5 secs
Elapsed time: 1 hr 55 mins
Video: 1 min 2 secs