Inverse Stereographic Projection of the Logarithmic Spiral

This Demonstration shows the inverse stereographic projection of a logarithmic spiral onto the unit sphere. You can move the spiral in the plane; it maps on the sphere as a loxodrome.


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


The inverse stereographic projection of the point to the unit sphere is the point .
A logarithmic or equiangular spiral is defined as a two-dimensional curve that cuts all radial lines at a constant angle. Its polar equation is given by .
A loxodrome on a sphere (spherical spiral) is a curve that cuts all meridians at the same angle. The stereographic projection of a loxodrome is a logarithmic spiral.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.