Note on the relation between the equinox and Guinot's non-rotating origin |
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| Authors: | Shinko Aoki Hiroshi Kinoshita |
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| Institution: | 1. Tokyo Astronomical Observatory, University of Tokyo, 181, Tokyo, Mitaka, Japan
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| Abstract: | We show that the non-rotating origin introduced by Guinot is nothing but a departure point on the movable equatorial plane, and discuss that, even if this is introduced, the uncertainty of determining the equinox correction cannot be avoided. A difficulty still remains, furthermore, when we take into account nutational effect, since the (true) departure point is not fixed but moves in RA direction on the equator secularly and periodically with respect to space. We discuss thoroughly the interrelation between old and new concepts, and propose an exact treatment sufficient enough for the precise requirements. |
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