An explanation and proof of "the complete system of astronomical chronology, unfolding the scriptures." [electronic resource] : In which The Truth and Reality of the Original Luni-Solar Radix Is clearly and fully ascertained; first, by Calculations à Priori; then confirmed, to the minutest Exactness, by Calculations à Posteriori, through an extensive Interval of 5800 Years. In a series of letters addressed to Mr. James Ferguson, Author of A Treatise of Astronomy upon Sir Isaac Newton's Principles of Philosophy. By the Rev. John Kennedy, Rector of Bradley, in Derbyshire, And Author of the Complete System of Astronomical Chronology Unfolding the Scriptures.