User:Xophist/s0

Math

cosh(x) is the average of e^x and e^−x
Group homomorphism
Tetractys
Hyperbolic function
Hyperbola
Quaternion
Tensor
Euler spiral
Aeonium tabuliforme rosette, Golden ratio Phyllotaxis
Fibonacci spiral approximates the Golden spiral (See Liber Abaci).
Golden spiral
Desargues' theorem
Radian
birectified 5-simplex, a convex Uniform 5-polytope.
Tesseract, one of the 6 Convex regular polychorons (4-Polytope)
graph of Tesseract, one of the 6 convex regular 4-polytopes (Polychoron).
graph of the 120-cell hecatonicosachoron, one of the 6 convex regular 4-polytopes (Polychorons).

Root system is a configuration of vectors in a Euclidean space satisfying certain geometrical properties. The concept is fundamental in the theory of Lie groups and Lie algebras. (See Differentiable manifold, Adjoint endomorphism, Abstract algebra, and Galois theory).

Lie algebra
Spirograph for drawing Hypotrochoids and Epitrochoids.
Harmonograph employs pendulums to create a geometric images such as Lissajous curves which describe Complex harmonic motion. (See Fourier series).

Lorenz system (Lorenz attractor)
Mandelbrot set
Mandelbrot set detail
"Seahorse tail", central endpoint is a Misiurewicz point.
Mandelbrot set detail
Tetrahedron
Hexahedron
Octahedron
Dodecahedron
Icosahedron

Materials

Physics

Astro

Milky Way
Apollo 17, Earth, 20th century
Solar flare, Solar transition region, Sun
Solar flare
Sun
Corona
Coronal loop
Kepler's Supernova
Type Ia supernova SN 1994D, near Lenticular galaxy NGC 4526
Galactic Center, Milky Way
Andromeda Galaxy, nearest Spiral galaxy (Canis Major Dwarf Galaxy is nearest to our Solar System)

Black hole, Stellar black hole
Summer Triangle, Asterism (astronomy)
Deneb, the Alpha star in the constellation Cygnus. Deneb in fiction
Cygnus X-1, Astrophysical X-ray source, Cygnus X-1 was the first X-ray source widely accepted to be a black hole candidate.

Ultraluminous X-ray source

Dwarf galaxy
Whirlpool Galaxy, a Spiral galaxy of the M51 Group in Constellation Canes Venatici, NGC 5195

Inferior conjunction of Venus and Earth. Successive inferior conjunctions of Venus repeat very near a 13:8 orbital resonance.

Opposition, Conjunction, and Syzygy in Spherical astronomy.
See also Astronomical transit, Occultation, and Axial precession (an Euler rotation).

Celestial sphere
See Celestial coordinate system, Right ascension and Declination (like Azimuth and Altitude in the Horizontal coordinate system).

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