Analemma
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In astronomy, an analemma is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same mean solar time over the course of a year. The change of position i
Analemma with date marks, printed on a globe, Globe Museum, Vienna, Austria
The analemma cutout of this sundial causes the edge of the shadow to fall on the true time.
Diagram of an analemma looking east in the Northern Hemisphere. The dates of the Sun's position are shown. This analemma is calculated for 9am, not photographed.
Groundtrack of QZSS geosynchronous orbit. Seen from the ground, its analemma would have a similar shape.
Anathem
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Anathem is a science fiction novel by American writer Neal Stephenson, published in 2008. Major themes include the many-worlds interpretation of quantum mechanics and the philosophical debate between
Analemma
…its mean position, moving at constant speed in the ecliptic, the quasi-satellite traces an analemma in the planet's sky, going around it once a year. Anathem – 2008 science fiction novel by Neal Stephenson Armillary sphere – Model of objects in the sky consisting of a framework of rings…
Roger Penrose inspired the novel's "Teglon tiles", based on the aperiodic Penrose tiles, and the discussion of the brain as a quantum computer, based on Penrose's The Emperor's New Mind.