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  2. Star polygon - Wikipedia

    en.wikipedia.org/wiki/Star_polygon

    The parametric angle 饾浖 (in degrees or radians) can be chosen to match internal angles of neighboring polygons in a tessellation pattern. In his 1619 work Harmonices Mundi , among periodic tilings, Johannes Kepler includes nonperiodic tilings, like that with three regular pentagons and one regular star pentagon fitting around certain vertices ...

  3. Octagram - Wikipedia

    en.wikipedia.org/wiki/Octagram

    In Unicode, the "Eight Spoked Asterisk" symbol is U+2733.; The spikes are specially visible around Jupiter's moon Europa (on the left) in this NIRCam image.. The 8-pointed diffraction spikes of the star images from the James Webb Space Telescope are due to the diffraction caused by the hexagonal shape of the mirror sections and the struts holding the secondary mirror.

  4. Position angle - Wikipedia

    en.wikipedia.org/wiki/Position_angle

    The concept of the position angle is inherited from nautical navigation on the oceans, where the optimum compass course is the course from a known position s to a target position t with minimum effort. Setting aside the influence of winds and ocean currents, the optimum course is the course of smallest distance between the two positions on the ...

  5. Pentagon - Wikipedia

    en.wikipedia.org/wiki/Pentagon

    In geometry, a pentagon (from Greek π苇ντε (pente) 'five' and γων委α (gonia) 'angle' [1]) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°. A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.

  6. Pentagram - Wikipedia

    en.wikipedia.org/wiki/Pentagram

    The five-pointed star is a symbol of the Bahá始í Faith. [28] [29] In the Bahá始í Faith, the star is known as the Haykal (Arabic: "temple"), and it was initiated and established by the Báb. The Báb and Bahá'u'lláh wrote various works in the form of a pentagram. [30] [31]

  7. Hexadecagon - Wikipedia

    en.wikipedia.org/wiki/Hexadecagon

    Each angle of a regular hexadecagon is 157.5 degrees, ... A hexadecagram is a 16-sided star polygon, ... A hexadecagrammic pattern from the Alhambra.

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  9. Pentagramma mirificum - Wikipedia

    en.wikipedia.org/wiki/Pentagramma_mirificum

    Pentagramma mirificum (Latin for "miraculous pentagram") is a star polygon on a sphere, composed of five great circle arcs, all of whose internal angles are right angles.

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