The Sun' Three Motions

The sun has three known motions: 1. An axial rotation, which is plainly shown by the appearance and disappearance of well-known spots upon his surface. The mean poriod of this axial motion is 23 1-3 of our days. 2. A motion around the center of gravity of the whole solar system- a motion which can only be aseertained by the use of very delicate instruments on account of his great mass, which is greater than the total of all the other bodies of the system combined. 3. A progressive motion through space in the direction of the constellation of Hercules. The rato dl speed of this last named motion is not known, but it is estimated to be 150,000,000 miles per year, and somo investigators even think it possible that the rato will exceed the above estiiaate by at ! i„..k.h