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association, but by Piazzi, when engaged
upon his great catalogue of stars. On Jan-
uary 1st, 1801, he observed a star which
had changed its place the next night. Its
motion was retrograde till January 11th, di-
rect after the 13th. Piazzi fell ill before he
had enough observations for computing the
orbit with certainty, and the planet disap-
peared in the sun’s rays. Gauss published
314
