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Like his fellow Pythagorean Ecphantus and the Academic Heraclides Ponticus, he believed that the daily movement of permanent stars was caused by the rotation of the Earth around its axis.
Planetary co-ordinate systems are defined relative to their mean axis of rotation and various definitions of longitude depending on the body.
A magnetometer determines the orientation of the generated field, which is interpolated to determine the axis of rotation.
South Pole, one of the two points where the Earth's axis of rotation intersects its surface