DescriptionGreat circle and inertial circle stereograph 512x256.png
English: Stereographic image of a sphere with a great circle that it tangent to the latitude of 30 degrees North. The blue line represents a half-swing of a Foucault pendulum, the half-swing when the pendulum swings in east-to-west direction. When the pendulum swing starts tangent to the latitude line, it proceeds towards the nearest pole.
This proves that the swing of the pendulum bob is not inertial motion. Inertial motion along the surface of a sphere follows a great circle.
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'''Description:''' <br/> Stereographic image of a sphere with a great circle that it tangent to the latitude of 30 degrees North. The blue line represents a half-swing of a Foucault pendulum, the half-swing when the pendulum swings in east-to-west directi