Most of those which astronomers use at the present time belong to him, having been deduced from analytic formulae, which, in their application, have been found alike, sure, uniform and manageable.
Karamihan ng mga astronomers na gamitin sa kasalukuyan sa kanya, having been deduced mula sa analytic formulae, na, sa kanilang aplikasyon, ay natagpuan magkamukha, sigurado, pare-pareho at pamahalaan.