A couple of step towers.Pigeons gather at the end of the tallest step tower.Measuring the skies.Detail of the measuring with the shadow of the instrument falling on a specific point.Several instruments.The sky translated into a half dome dug in the ground.Precision instruments.Precise construction of giant measuring tools.Clock tower between observatory and royal palace.Stairs to nowhere.Instrument to measure celestial distances.Instrument to track the sun.

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