The description and use of a new portable orrery. [electronic resource] : On a simple construction, Representing The Motions And Phenomena Of The Planetary System, But More Particularly The Motions Of The Earth And Moon Round The Sun; From Whence The Nature And Causes Of The Vicissitudes Of The Seasons, Days And Nights, Solar And Lunar Eclipses, &C. Are Clearly And Familiarly Explained. To which is prefixed, a short account of the solar system, OR The True System Of The World. With three copper-plates. The fifth edition, with additions ; containing a concise account of the most recent discoveries by Dr. Herschell, & c. and the Description of a larger and more complete Portable Orrery. By William Jones, Mathematical Instrument Maker.