Leonids left|upright|thumb|The great Leonid shower storm of 1833 The great meteor shower of November 1866 turned his attention to the Leonids, whose probable path and period had already been discussed and predicted by Hubert Anson Newton in 1864. Newton had asserted that the longitude of the ascending node, that marked where the shower would occur, was increasing and the problem of explaining this variation attracted some of Europe's leading astronomers.
Leonids left|upright|thumb|The great Leonid shower storm of 1833 The great meteor shower of November 1866 turned his attention to the Leonids whose probable path and period had already been discussed and predicted by Hubert Anson Newton in 1864 Newton had asserted that the longitude of the ascending node that marked where the shower would occur was increasing and the problem of explaining this variation attracted some of Europe's leading astronomers