free and forced precession of Earth illustrated with a gyroscope
Channel: APMG Group - University of Bonn
Date: 2021-12-06

We use a gyroscope to demonstrate how Earth rotates with respect to the fix stars and explain forced and free precession.




Image Credits:

Earth texture:
Reto Stöckli, NASA Earth Observatory
https://visibleearth.nasa.gov/images/73801/september-blue-marble-next-generation-w-topography-and-bathymetry/73803l

ocean currents:
NASA/Goddard Space Flight Center Scientific Visualization Studio 
https://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=3913

tectonic plates:
https://commons.wikimedia.org/wiki/File:Tectonic_plates.png

Earth cross section:
Surachit (CC BY-SA 3.0)  https://creativecommons.org/licenses/by-sa/3.0/deed.en
https://commons.wikimedia.org/wiki/File:Oceanic_spreading.svg

tides:
Bleckneuhaus (CC BY-SA 4.0)  https://creativecommons.org/licenses/by-sa/4.0/deed.en
https://commons.wikimedia.org/wiki/File:Gezeiten-Beschleunigung_an_der_Erdoberfl%C3%A4che.png