Ptolemy has even ( since Brahe, 1598 ) been accused by astronomers of fraud for stating ( " Syntaxis ", book 7, chapter 4 ) that he observed all 1025 stars : for almost every star he used Hipparchus's data and precessed it to his own epoch centuries later by adding 2?0'to the longitude, using an erroneously small precession constant of 1?per century.
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