Celestial Sphere: Ecliptic Plane in Equirectangular Mapping | Star Chart | Astronomy Note

Under cylindrical projection in equirectangular form, the celestial sphere map (centered around Earth) of stars and constellations contains a curve for ecliptic line: this is a direct result from the topology of the curvature of a sphere. * Star chart: https://en.wikipedia.org/wiki/Hipparcos#/media/File:Hipparcos_Catalogue_equirectangular_plot.svg * The celestial sphere: https://www.fromspacewithlove.com/celestial-sphere/