Page:Reflections upon ancient and modern learning (IA b3032449x).pdf/215

 (s) had ever heard any thing of him, when they attributed the Invention of Telescopes to Jacobus Metius of Alkmaer. However it taking Air, Galileo Galilei took the Hint, and made several Telescopes, by which making Observations upon heavenly Bodies, he got himself immortal Honour. Thereby (t) he discovered Four Planets moving constantly round Jupiter, from thence usually called his Satellits, which afterwards were observed to have a constant, regular, and periodical Motion. This Motion is now so exactly known, that Mr. Flamstead, who is one of the most accurate Observers that ever was, has been able to calculate Tables of the Eclipses of the several Satellits, according to which, Astronomers in different quarters of the World, having Notice of the precise Time when to look for them, have found them to answer to his Predictions, and published their Observations accordingly. This is an effectual Answer to all that Rhapsody which Stubbe (u) has collected in his Brutal Answer to Mr. Glanvile's Plus Ultra, about the Uncertainty of all Observations made by Telescopes; since it is impossible to calculate the Duration of any Motion justly by fallacious and uncertain Methods. By the Eclipses of