equiangular spiral - meaning and definition. What is equiangular spiral
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What (who) is equiangular spiral - definition

SELF-SIMILAR GROWTH SPIRAL WHOSE CURVATURE PATTERN APPEARS FREQUENTLY IN NATURE
Equiangular spiral; Spira mirabilis; Log spiral; Equiangular Spiral; Logarithmic spirals; Logarithmic Spiral; Spira Mirabilis; Growth spiral
  • Animation showing the constant angle between an intersecting circle centred at the origin and a logarithmic spiral.
  • A section of the [[Mandelbrot set]] following a logarithmic spiral
  • Cutaway of a [[nautilus]] shell showing the chambers arranged in an approximately logarithmic spiral.  The plotted spiral (dashed blue curve) is based on growth rate parameter <math>b = 0.1759</math>, resulting in a pitch of <math>\arctan b \approx 10^\circ</math>.
  • Examples for <math>a= 1,2,3,4,5</math>
  • Definition of slope angle and sector

Spiral (railway)         
  • Loop (Agony Point) on the DHR, India
  • Albulabahn]]
  • Dduallt]] on the [[Ffestiniog Railway]], Wales.
  • Geumdae 2nd Tunnel in [[Jungang Line]], [[South Korea]]
  • zig zag]] in [[Hisatsu Line]], Japan
  • 1903 view of Riflesight Notch loop, near [[Rollins Pass]] in Colorado
  • Myanmar]]
  • [[Tehachapi Loop]], on the [[Union Pacific Railroad]], California, United States, viewed from the air.
  • Guanjiao Spiral on [[Qinghai–Tibet Railway]] at night, it was replaced by a 32-km long tunnel in 2014
RAILWAY FEATURE
Railway spiral
A spiral (sometimes called a spiral loop or just loop) is a technique employed by railways to ascend steep hills.
Euler spiral         
  • Animation depicting evolution of a Cornu spiral with the tangential circle with the same radius of curvature as at its tip, also known as an [[osculating circle]].
  • right
PLANE CURVE GIVEN BY FRESNEL INTEGRALS SUCH THAT THE CURVATURE INCREASES LINEARLY WITH CURVE LENGTH
Cornu spiral; Clothoid; Sici spiral; Si-ci-spiral; Nielsen spiral; Euler's spiral; Cornu Spiral; Transition spiral
An Euler spiral is a curve whose curvature changes linearly with its curve length (the curvature of a circular curve is equal to the reciprocal of the radius). Euler spirals are also commonly referred to as spiros, clothoids, or Cornu spirals.
Spiral galaxy         
  • Spiral galaxy, LEDA 2046648, is about one billion light-years away.
  • access-date=11 August 2015}}</ref>
  • newspaper=ESA / Hubble}}</ref>
  • Animation of orbits as predicted by the density wave theory, which explains the existence of stable spiral arms. Stars move in and out of the spiral arms as they orbit the galaxy.
  • [[NGC 1300]] in [[infrared]] light.
  • Tuning-fork-style diagram of the [[Hubble sequence]]
  • Spiral galaxy [[NGC 1345]]
  • The bright galaxy [[NGC 3810]] demonstrates classical spiral structure in this very detailed image from Hubble. Credit: ESA/Hubble and NASA.
  • Spiral galaxy [[NGC 6384]] taken by [[Hubble Space Telescope]].
  • Spiral galaxy NGC 2008
  • WISE]] data
  • [[Barred spiral galaxy]] [[UGC 12158]].
GALAXY HAVING A NUMBER OF ARMS OF YOUNGER STARS THAT SPIRAL OUT FROM THE CENTRE CONTAINING OLDER ONES
Spiral arm; Halo star; Spiral nebula; Spiral Galaxies; Spiral galaxies; Galactic spheroid; Spiral nebulae; Galaxy: Spiral; Spiral arms; Stellar spheroid; Spiral Galaxy; Spheroidal halo; Stellar halos; Stellar haloes; Galactic arm; LEDA 2046648
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae Alt URL(pp. 124–151) and, as such, form part of the Hubble sequence.

Wikipedia

Logarithmic spiral

A logarithmic spiral, equiangular spiral, or growth spiral is a self-similar spiral curve that often appears in nature. The first to describe a logarithmic spiral was Albrecht Dürer (1525) who called it an "eternal line" ("ewige Linie"). More than a century later, the curve was discussed by Descartes (1638), and later extensively investigated by Jacob Bernoulli, who called it Spira mirabilis, "the marvelous spiral".

The logarithmic spiral can be distinguished from the Archimedean spiral by the fact that the distances between the turnings of a logarithmic spiral increase in geometric progression, while in an Archimedean spiral these distances are constant.