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  2. Halo (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Halo_(optical_phenomenon)

    For two hours in the morning of 20 April 1535, the skies over the city were filled with white circles and arcs crossing the sky, while additional suns (i.e., sun dogs) appeared around the Sun. Light pillar

  3. Parhelic circle - Wikipedia

    en.wikipedia.org/wiki/Parhelic_circle

    A parhelic circle is a type of halo, an optical phenomenon appearing as a horizontal white line on the same altitude as the Sun, or occasionally the Moon. If complete, it stretches all around the sky, but more commonly it only appears in sections. [2] If the halo occurs due to light from the Moon rather than the Sun, it is known as a ...

  4. Dyson sphere - Wikipedia

    en.wikipedia.org/wiki/Dyson_sphere

    Inspired by the 1937 science fiction novel Star Maker by Olaf Stapledon, [4] the physicist and mathematician Freeman Dyson was the first to formalize the concept of what became known as the "Dyson sphere" in his 1960 Science paper "Search for Artificial Stellar Sources of Infra-Red Radiation".

  5. Heliocentrism - Wikipedia

    en.wikipedia.org/wiki/Heliocentrism

    The objects on orange orbits (Mercury, Venus, Mars, Jupiter, and Saturn) revolve around the Sun. Around all is a sphere of fixed stars, located just beyond Saturn. Prior to the publication of De Revolutionibus , the most widely accepted system had been proposed by Ptolemy , in which the Earth was the center of the universe and all celestial ...

  6. 22° halo - Wikipedia

    en.wikipedia.org/wiki/22°_halo

    22° halo around the Sun 22° halo around the Moon. A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent diameter of approximately 22° around the Sun or Moon. Around the Sun, it may also be called a sun halo. [1] Around the Moon, it is also known as a moon ring, storm ring, or winter halo.

  7. Circumzenithal arc - Wikipedia

    en.wikipedia.org/wiki/Circumzenithal_arc

    The circumzenithal arc, also called the circumzenith arc (CZA), the upside-down rainbow, and the Bravais arc, [1] is an optical phenomenon similar in appearance to a rainbow, but belonging to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops.

  8. Halo (religious iconography) - Wikipedia

    en.wikipedia.org/wiki/Halo_(religious_iconography)

    In the religious art of Ancient Greece, Ancient Rome, Christianity, Hinduism, and Buddhism (among other religions), sacred persons may be depicted with a halo in the form of a circular glow, or flames in Asian art, around the head or around the whole body—this last form is often called a mandorla.

  9. Copernican heliocentrism - Wikipedia

    en.wikipedia.org/wiki/Copernican_heliocentrism

    His hypotheses are that the fixed stars and the Sun remain unmoved, that the Earth revolves about the Sun on the circumference of a circle, the Sun lying in the middle of the Floor, and that the sphere of the fixed stars, situated about the same center as the Sun, is so great that the circle in which he supposes the Earth to revolve bears such ...

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