Improved nautical almanac, or True navigator, astronomically, mathematically, and mechanically arranged (1859)
Colby, Hall · New York : The author · leaf 22
be the focus ofYenuss orbit; and the common center of gravity between Mercury, Yen usand the Sun will be the focus of the Earths orbit. Thus the attraction ofthe planets nearest the Sun will, in a small degree, affect the foci of thosemore remote. Except the foci of Saturn and Herschel, however,… … ASTRONOMY AND NAVIGATION. H Though stationary in respect to surrounding objects, the Sun is not desti-tute of motion. It revolves on its axis from west to east in 25 d. 15 h. 16 m.,or, according to some authors, in 25*d. 10 h. The Suns rotation is knownfrom the revolution of its spots. The form of…
