Motion of the Earth

Seasons and the Zodiac: Day, Year and Calendar
  • Albrecht Unsöld
Part of the Heidelberg Science Library book series (HSL)


We now consider the orbital motion, or revolution, of the Earth around the Sun, in the sense of Copernicus, and also the rotation of the Earth around its axis as well as the motion of the axis itself. Here we adopt the observer’s standpoint. We shall develop Newton’s theory of the motions of the Earth and the planets in accordance with his theories of mechanics and gravitation in Chapter 6.


Orbital Motion Universal Time Solar Time Summer Solstice Winter Solstice 
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Histories of Astronomy

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  6. Struve, O., and V. Zebergs: Astronomy of the 20th century. New York-London: Macmillan 1962.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1969

Authors and Affiliations

  • Albrecht Unsöld
    • 1
  1. 1.Institute for Theoretical Physics and University ObservatoryKielGermany

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