Apsides
the plural of APSE or APSIS; in astronomy, the two points in the elliptic orbit of a planet where it is at the greatest and the least distance respec- tively from the body around which it re- volves. The moon moving in an elliptic greatest and the least distance respec tively from the body around which it revolves. The moon moving in an elliptic orbit around the earth, which is situated in one of the foci, is at what was ancientincluding the earth and comets, moving in elliptic orbits around the sun, which is situated in one of the foci, pass through ly called its higher apse when it is in apogee, and at its lower one when it is in situated in one of the foci, pass through perigee. Similarly, the primary planets, apojove in in elliptic orbits around the sun, which is ion, and their lower one when in periion, and their lower one when in perihelion. It is the same with the satellites of Jupiter when they are in the ap and perijove.
The line of the apsides is the line connecting the two apsides of a primary or secondary planet. Were it not for a motion of the apsides, it would exactly coincide with the major or longer axis of the ellipse.
The progression of the moon's apsides is a slow movement in the position of the motion, in one revolution of the moon, apsides of the moon, produced by the perand in the same direction as her progresturbing attraction of other heavenly bodies. It is about three degrees of angular sion in her orbit. The apsides of the primary planets are also, to a certain extent, perturbed.
The revolution of the moon's apsides is primary planets are also, to a certain takes place in 3,232.5753 mean solar the movement of the apsides around the days, or about nine years. the movement of the apsides around the entire circumference of the ellipse, which takes place in 3,232.5753 mean solar The revolution of the moon's apsides is times backward in the apsides of Venus movement sometimes forward and somet APSLEY STRAIT and Mercury, from perturbations caused by other heavenly bodies.