Line-of-Apsides (aka Major-axis Of The Ellipse)
In space and astronautical engineering, the Line-of-Apsides refers to the major axis of the ellipse that describes the orbit of a celestial body, such as a planet or a satellite, around another celestial body, such as a star. The Line-of-Apsides is the longest diameter of the ellipse and it passes through the two points of the orbit that are farthest apart, known as the apsides. The apsis that is farthest from the attracting body is called the apoapsis or apogee, while the apsis that is closest to the attracting body is called the periapsis or perigee. The Line-of-Apsides is an important parameter in the study of celestial mechanics, as it determines the shape and size of the orbit, as well as the period and velocity of the orbiting body. It is also used in the design and planning of space missions, such as interplanetary transfers and satellite launches.
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