SOLAR DYNAMICS— SOME NEW ASTRONOMY. 323 



Sun's orbital plane ; and then momentum carries it beyond. The movement out, 

 on either side, is always from momentum ; the movement in is effected by the forces 

 as above explained. Thus the Sun in its revolution in 25,000 years, swings back 

 and forth with reference to the orbit of its superior. Thus the several planets in 

 the times' of their respective revolutions swing back and forth with reference to 

 the orbit of the Sun. Thus the moon in the time of its revolution swings back 

 and forth with reference to the orbit of the earth. Thus the satellites of Jupiter 

 and Saturn swing back and forth with reference to the orbits of their rulers. If 

 in all these cases instead of saying orbit, I had said path, it would have been 

 equally true, though orbits and paths are very different things. 



The solar system presents many wonderful harmonies ; so there is room here 

 for analogical reasoning. As a rule satellites and planets make their revolutions 

 nearly in the plane of their own equators. This would lead us to expect the 

 same of the Sun. As a rule subordinate spheres revolve nearly in the planes of 

 the equators of their primaries. This would lead us to expect that all, the Sun 

 with the rest, revolve nearly in the same general direction. The plane of the 

 moon's equator is south of the eaj-th during one-half of its revolution, and north 

 during the other half. The plane of the earth's equator is south of the Sun dur- 

 ing one-half of its revolution, and north of the Sun during the other half. The 

 plane of the Sun's equator is south of its ruler during one-half of its revolution, 

 and north of its ruler (Sirius?) during the other half. The Moon makes its revo- 

 lutions around the earth in a certain manner. Why should not the earth and 

 and the Sun make their revolutions in like manner ? 



The forces affecting the Moon cause it to change its position relative to the 

 earth amounting to four right angles in the direction of its own equatorial plane, 

 while they cause a change at right angles to that plane, amounting to four times 

 i^°. The forces affecting the earth cause it to change its position relative to 

 the Sun, amounting to four right angles in the direction of its equatorial plane, 

 while they cause a change at right angles to that plane, of four times 23^°. The 

 forces affecting the Sun cause it to change its position relative to its ruler (Sirius?) 

 amounting to four right angles in the direction of its own equatorial plane while 

 they cause a change at right angles to that plane of four times — degrees. 



Let us look at Jupiter and Saturn \ these have systems not unlike the Sun. 

 Jupiter has four satellites*. The nearest one revolves nearly in the plane of his 

 equator, the next a little more out, and so the next ; the farthest satellites having 

 the farthest range. So of Saturn's rings and satelhtes. The rings revolve in 

 the plane of his equator; the satellites nearly in that plane; having range from it 

 according to their distances. 



So of the Sun , and its subordinates. Mercury revolves nearly in the plane 

 of the Sun's equator, while larger latitude is allowed to the orbits of the more 

 remote planets. All this warrants us in expecting to find the Sun moving in a 

 direction not far from the plane of its own equator. I do not propose to settle 

 with precision either the direction toward which the Sun is moving or its rate of 

 motion. I leave this for the astrononoer and the mathematician, neither of which 



