This rotatable star chart was produced in Holland by Alro The Hague for Rob Walrecht and the Apollo moving planatarium in 1986. It consists of 2 large plastic discs that rotate in order to show the celestial sky every hour of every day of the year in The Netherlands and Belgium. It has instructions in the back in Dutch only. It is in very good condition without cracks and with only small signs of normal use or age. It is fully functioning and the diameter of this slide rule is 25 cm or 10 inches. Check the attached video on how to work such a vintage man tool!
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Alro Walrecht Planisphere Astronimical circular slide rule 1986 Holland
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Alro Walrecht Planisphere Astronimical circular slide rule 1986 Holland
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