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Two intersecting circles rotatable in six steps of unequal angle and a third circle rotatable by 72°.
Aldebaran, designated Alpha Tauri (? Tau), is an orange giant star located about 65 light-years from the Sun in the zodiac constellation of Taurus. It is the brightest star in its constellation.
The planetary exploration probe Pioneer 10 is currently heading in the general direction of the star and should make its closest approach in about two million years. The name Al-de-baran is Arabic for "foremost" or “leading star” because it precedes or leads the Pleiades.
First the puzzle seems to have two intersecting circles. Like the earlier Capella (from the same inventor) the circles are rotatable in six steps of unequal size. Unlike the earlier puzzle Aldebaran has for a third circle. With a star shaped plug the user can turn this third circle by steps of 72°.
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