The Calculation of Solar Eclipses Without Parallaxes: With a Specimen of the Same in the Total Eclipse of the Sun, May 11. 1724. Now First Made Publick. To which is Added, A Proposal How, with the Latitude Given, the Geographical Longitude of All the Parts of the Earth May be Settled by the Bare Knowledge of the Duration of Solar Eclipses, and Especially of Total Darkness. With an Account of Some Late Observations Made with Dipping Needles, in Order to Discover the Longitude and Latitude at Sea