![]() If we assume that it takes 24 hours for the stars to turn around 360° (actually it is us that is turning) then that works out to be four minute per degree, or sixteen minutes for four degrees. Along with some GCSE maths this gave me the angle the stars had moved through during the length of time over which the picture was taken. The exposure length was a wee bit trickier and required measuring the length from the south pole (below the horizon) and the length of the star trail. The latitude, I confess, I did not try and figure out as it said it in further down in the puzzles webpage and unfortunately I read it and spoilt that part of the conundrum. ![]() So, I assumed the image was taken in the Southern Hemisphere, with the stars spinning around the south pole. I don’t recognise any of these star patterns. The first challenge was relatively straight forward as each line on the picture represents a star and looking at them for a while I recognised none of the constellations that we see spinning around the pole star, which points to North here in the Northern Hemisphere. The picture is a star trail picture that can be used to find outġ – Which hemisphere was the picture taken in?ģ – How long was the exposure (I threw this question in myself as I was curious)?Ĥ – In which direction was the picture taken? So now, here it is a lovely nerdy puzzle. I had an idea when I first read it but had to save it to later when I could spend more time on it. The puzzle is from Tristan Gooley, who wrote an excellent book that has loaded me up with intresting observations to take with me when out with groups on the hills. This morning I spotted an astronomy/navigation puzzle that got me thinking. This does not mean I do not like puzzles. I think my awfull speling could be partley to blame. I hate crossword puzzles, I really hate them passionately.
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