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Thanks Clare and Peter, yes getting a 7hr cloud free window is one of the challenges for this project, but there are other complications too. There are only about 3 Lunar cycles each year, in which you can get enough hours in darkness. In addition, there are only about 2-3 nights in each of those cycles when the moon phase is suited to showing the light/shadow movement. I'm hoping to try again next winter.
Steve
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