Point in orbit

Usage examples of apsis.

From the statue issued a great gasp of graying smoke, that clouded the apsis in which the throne stood and came gorging into the cella, obscuring the graven images along the walls.

When this apsis, therefore, of Mars shall appear in Virgo, who shall expect less than a strange catastrophe of human affairs in the commonwealth, monarchy, and kingdom of England?

And, we might also ask, why the tangential resistance to the comet of Encke should not also produce a retrograde motion in the apsides of the orbit, instead of diminishing its period?

It is easy to see that the effect of this action, which is called the revolution of the apsides, or, as the word means, the movement of the poles of the ellipse, is to bring the earth, when a given hemisphere is turned toward the sun, sometimes in the part of the orbit which is nearest the source of light and heat, and sometimes farther away.

And, we might also ask, why the tangential resistance to the comet of Encke should not also produce a retrograde motion in the apsides of the orbit, instead of diminishing its period?