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attain accuracy, using certain stars for de-
termining the errors of his instruments; and
he always reduced his observations to a form
in which they could be readily used. He in-
troduced new methods for determining the
position of the equinox and the right ascen-
sion of a fundamental star. He produced
a catalogue of 2,935 stars. He supplied Sir
Isaac Newton with results of observation re-
363
