Abstract
Polar motion is the motion of the true celestial pole as defined by the theory of precession and nutation, e.g., of the Celestial Ephemeris Pole (CEP, see Chapter 8), with respect to the pole (third axis) of a conventionally selected earth “fixed” (terrestrial) reference frame (CTS). The latter is usually selected to be near the average position of the CEP taken over a certain time interval and is called the Conventional Terrestrial Pole (CTP). In geodesy both geodetic and astronomic coordinates (latitude and longitude) are referred to the CTS. The terrestrial Cartesian coordinate system thus has its origin at the center of the earth: the first axis is oriented towards the Greenwich Mean Astronomic Meridian of zero longitude, the third axis towards the CTP, and the second axis is perpendicular to both and forms a right-handed coordinate system.
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© 1989 Kluwer Academic Publishers
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Mueller, I.I. (1989). Conventional Terrestrial Reference Frames. In: Kovalevsky, J., Mueller, I.I., Kolaczek, B. (eds) Reference Frames. Astrophysics and Space Science Library, vol 154. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0933-5_8
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DOI: https://doi.org/10.1007/978-94-009-0933-5_8
Publisher Name: Springer, Dordrecht
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