...M', M", &c. and E may, for small portions near those points, be held as parallel. \>t is the ////( of the nodes, that is, the intersection of the plane...passing through its centre and perpendicularly to 5s, would divide the Moon into two hemispheres, the convex surface of the one being bright, that of...

...an eclipse does not thus necessarily occur every month, yet it might so occur. We have here supposed the intersection of the plane of the moon's orbit with the plane of the earth's to be in the earth's orbit; so that the line of nodes may coincide with the line of the earth's...

...an eclipse does not thus necessarily occur every month, yet it might so occur. We have here supposed the intersection of the plane of the moon's orbit with the plane of the earth's to be in the earth's orbit; so that the line of nodes might coincide with the line of the earth's...

...that plane with the plane of the ecliptic, and is the line of the moon's nodes ; 01 is the line of intersection of the plane of the moon's orbit with the plane of the earth's equator. Let i be the angle of inclination of the plane of the moon's orbit to the ecliptic...

...surface passes through this path, and through the centres of the earth and sun, that surface will form the plane of the ecliptic, or the plane of the earth's orbit. From what has been already said (p. 340), it might be concluded, that the earth's axis is neither in...

...diameter) makes one revolution from west to east in about 9 years, while the line of nodes (the line of intersection of the plane of the moon's orbit with the plane of the ecliptic) moves from east to west and completes one revolution in about 19 years. These motions of the line of...