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Avior
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A doctrinaire puzzle consisting of two intersecting circles that can be turned by steps of 90.

Epsilon Carinae (? Carinae), officially named Avior is a binary star in the southern constellation of Carina. At apparent magnitude +1.86 it is one of the brightest stars in the night sky, but is not visible from the northern hemisphere. The False Cross is an asterism formed of Delta Velorum, Kappa Velorum, Iota Carinae and ? Carinae. It is so called because it is sometimes mistaken for the Southern Cross, causing errors in astronavigation.
Avior is located roughly 560660 light-years (170200 parsecs) from the Sun.
The primary component has an apparent visual magnitude of 2.2, which by itself would still make it the third-brightest star in the constellation. The fainter secondary companion has an apparent visual magnitude of 4.1, which, if it were a solitary star, would be bright enough to be seen with the naked eye.
The name Avior is not classical in origin. It was assigned to the star by HM Nautical Almanac Office in the late 1930s during the creation of The Air Almanac, a navigational almanac for the Royal Air Force. Of the fifty-seven navigation stars included in the new almanac, two had no classical names: Epsilon Carinae and Alpha Pavonis. The RAF insisted that all of the stars must have names, so new names were invented. Alpha Pavonis was named "Peacock", a translation of Pavo, whilst Epsilon Carinae was called "Avior".

The presence of "orbits" makes this puzzle look like Hungarian rings. However, this is a puzzle consisting of two intersecting circles that can be turned by steps of 90. Unlike other puzzles named after stars it is a doctrinaire puzzle.

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