Touching the Earth
The earth as seen from Apollo 17, December, 1972.
The earth as seen from Apollo 17, December, 1972.

WikiMechanics uses touching the Earth as a reference sensation. So we presume that there are some feelings to do with life on Earth that are known to just about everyone; for example, feeling the pressure of bodily contact with the floor.

We also use the Earth to define some constants. For details, see the discussions about the quark metric, historical order and Planck's postulate.


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