Positions in the Sky

  • Chris Kitchin
Part of the Patrick Moore’s Practical Astronomy Series book series (PATRICKMOORE)


Most people are familiar with the idea of plotting a graph. This is one example of a coordinate system, the x and y coordinates (abscissa and ordinate) providing a means of specifying the position of a point within the two-dimensional surface occupied by the graph. It is a simple extension of the idea to give completely the position of an object in space using three coordinates, x, y and z (Figure 4.1).


Reference Direction Julian Date Solar Time Sidereal Time Greenwich Meridian 
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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Copyright information

© Springer-Verlag London 2003

Authors and Affiliations

  • Chris Kitchin

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