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Arab astronomers invented the astrolab, a device for helping them mark the positions of the planets and constellations through the seasons.

Before them the Greeks had invented the "Ankylothera" device, sort of a celestial calendar.

Prior to both of these groups Egyptians marked the ground with stones to note the position of the sun at its solstices and equinoxes. Stone henge, in England, was an astronomical observatory. There are also rock arrangements in South America American Indian observers used to note the positions of stars.

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