| Apsis (apsis) |
|---|
| n. | ( p"s***ibreve]s) |
|---|
| ||Ap"sis |
| ;
pl. Apsides (p"s***ibreve]*d***emacr]z). See
Apse. [L. apsis, absis, Gr. "apsi`s,
"apsi^dos, a tying, fastening, the hoop of a wheel, the wheel, a
bow, arch, v |
One of the two points of an orbit, as of a planet or
satellite, which are at the greatest and least distance from the central
body, corresponding to the aphelion and perihelion of a planet, or to the
apogee and perigee of the moon. The more distant is called the higher
apsis; the other, the lower apsis; and the line joining them,
the line of apsides.
In a curve referred to polar
coördinates, any point for which the radius vector is a maximum or
minimum.
Same as Apse.
|
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In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 