Page 320 - 89 history of astronomy_opt

or seventh magnitude. Altogether, nine-
teen observations of Uranus’s position, from
the time of Flamsteed, in 1690, had been
recorded.
In 1790 Delambre, using all these ob-
servations, prepared tables for computing
its position. These worked well enough for
a time, but at last the differences between
the calculated and observed longitudes of
320