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Investigate coordinate systems, epochs and copying errors together.
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- Methodological question
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Verbunt and van Gent compare the catalogues of Ptolemaios and Ulugh Beg with modern Hipparcos data. Matching historical stars and measuring position differences requires understanding the coordinate epoch.
Form separate hypotheses for measurement, transformation and copying differences.
Other names / spellings: Epoch · Presesyon · Precession · Koordinat · Coordinates
EVIDENCE AND SOURCE
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- Verbunt & van Gent · Historical catalogue comparison, 2012
Original research paper and data references.
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The linked institution’s record and usage conditions apply. Catalogue access does not by itself permit republication of the file.