Some Considerations of Mr. Nic. Mercator, Concerning the Geometrick and Direct Method of Signior Cassini for Finding the Apogees, Excentricities, and Anomalies of the Planets; As That was Printed in the Journal des Scavans of Septemb. 2. 1669: Which Considerations are Here Delivered in the Latine Tongue, Wherein they Were Written by the Author, as Chiefly Regarding the Learn'd in Astronomy, viz. Clarissimi Cassini Methodus Investigandi Apogea, Excentricitates & Anomalias Planetarum, Breviter Exposita & Demonstrata