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It is fairly simple to use, but doing something with the results are very complex. The mirrors are designed to allow you to measure the angle between a star or planet and the horizon. Basically looking through the eye piece at the body in question and adjusting the arms with a sort of rocking motion so that the body appears to touch the horizon will allow you to read the angle. This also has to be done with an exact time reference. The time factors into the complex series of calculations that allow you to determine where to draw a line on your map or chart.

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