The young gentleman's astronomy, chronology, and dialling, containing such elements of the said arts or sciences, as are most useful and easy to be known / [Edward Wells].

Wells, Edward, 1667-1727.

Date:: 1725

Credit: The young gentleman's astronomy, chronology, and dialling, containing such elements of the said arts or sciences, as are most useful and easy to be known / [Edward Wells]. Source: Wellcome Collection.

30/370 (page 12)

$! 2 Of the Copernican the following Inftances would be found more exaft, were the Periods and Diftances more exactly exprefled by Numbers. In like manner the Pe¬ riod of the Earth is a little more than four Times greater than the Period of Mercury \ and fo the Squares of the Numbers expreffing thofe Periods will be almoft as 17 and 1. And the Distance of the Earth from the Sun being divided into teh Parts, the Di- ftance of Mercury from the Sun is found by Obfervations to be (little lefs than 4 fuch Parts, viz.) 3 fuch whole Parts, and 9 Tenths of ano¬ ther, the Cubes of which Numbers (viz. 10 and 24.-) are 1000 and 59. But it is lObvious, that 17 is to 1, much as 1000 to 59. And fo of the other primary Planets. As tor the fecondary Planets, the Periodical Times of the Satellites of as to the Jupiter are (as is above obferved) re- S'1 fpe&ively as i 7 r, and i6|, and their Dutances are as 5 9,14-I, and 25. But the Square of die Perio¬ dical Time of the innermoft Sat tiles, namely 3, is to 13 the Square of the Periodical Time of the fecond Safeties, as 170 the Cube of the Diftance of the 9 Ani at jo$