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Stand a few hundred meters from the lighthouse (see picture attached) at a dark enough hour (2100 hrs, for example). Face the lighthouse. Now slowly turn so that the light source is just of screen, while doing so observe the beams.
Stand a few hundred meters from the lighthouse (see picture attached) at a dark enough hour (2100 hrs, for example). Face the lighthouse. Now slowly turn so that the light source is just of screen, while doing so observe the beams.
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