A System of Astronomy, on the Principles of Copernicus —— Containing, Besides the Usual Astronomical Calculations, a Catalogue of Eclipses, Visible in the United States During the Present Century

----- 关于哥白尼原理的天文系统

ISBN: 9781333323295 出版年：2016 页码：251 John Vose Forgotten Books

To a spectator at the sun the planets would appear to move in harmonious order from west to east; he would probably take the period of Mercury as a standard for comparing the periods of planets; the paths ofthe planets would seem to cross each other.