Autumn Leaves

The astrolabe was very used by sailors, namely to measure the height of the stars, such as the polar star and the sun, above the horizon.

The astrolabe is an instrument used to measure the height of the stars, such as the polar star and the sun, above the horizon. It was very used by sailors and the information it provides allows us to calculate the latitude of the place where we stand. The equivalent to the actual and modern GPS