Acamar
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The basis for this puzzle was Douglas Engel's "Dancing gears", see the seperate entry. Later, Rashkey was released with an identical topology, but with slightly different relative sizes of the pieces. The inventor added one more circle. heta Eridani, Latinized from θ Eridani, is a binary system in the constellation of Eridanus with a combined apparent magnitude of 2.88.[6] Its two components are designated θ1 Eridani, formally named Acamar /ˈækəmɑːr/, and θ2 Eridani. The system's distance from the Sun based on parallax measurements is approximately 165 light-years. The system bore the traditional name Acamar, derived from the Arabic آخِر النَّهْر Ākhir an-nahr, which means "the end of the river", via a Roman-alphabet handwriting misread "rn" to "m". The term "Ākhir an-nahr", or "Achr al Nahr", appeared in the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, which was translated into Latin as Postrema Fluminis. Historically, Acamar represented the end of the constellation Eridanus.[8][18] Now that distinction is held by the star Achernar, which shares the same Arabic etymology. Achernar is not visible from the Greek isles (latitudes > 33° North),[19] hence the choice of Acamar as the river's end during the time of Hipparchus and, later, Ptolemy. Theta Eridani is a binary system with some evidence suggesting it is part of a multiple star system. The main star, θ1 Eridani, is of spectral class A4 with a +3.2 apparent magnitude. Its companion star, θ2 Eridani, is of spectral class A1 with an apparent magnitude of +4.1. The angular separation of the two stars is equal to 8.3 arcseconds.
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