The Earth and Time

  • Gerald North
Part of the Macmillan Mastering Series book series


The ancients considered the Earth to be flat and located at the centre of the Universe, with the sky a crystal dome on which the stars were fixed. Around 2 000 bc Aristotle realised that the Earth is a globe. There is clear evidence to support this view. For instance, there is the differing altitude of the pole star as seen from different locations and the fact that the most southerly of the constellations are only rendered visible by travelling southwards (the converse is true for people living in the southern hemisphere). More commonly known is the phenomenon of a ship travelling away from the shore disappearing from view whilst its sails are still visible above the horizon. The sails are then seen to ‘sink’ below the horizon as the ship further recedes.


Celestial Body Solar Time Sidereal Time Vernal Equinox Celestial Pole 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Gerald North 1988

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  • Gerald North

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