A few weeks ago I was giving a presentation […]
OK there are two things that never go well together. Serious amateur astronomical observing and light pollution. The most irritating form of light pollution is something that is cyclical and periodic, but not constant. For this very reason, the last place one would imagine to go observing would be at a lighthouse. The periodic flares of light are the worst irritant to an observer, as the eye never adjusts to any particular steady state.