APSIS
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Traducere: română
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‖Ap"sis (ăp"sĭs), n.; pl. Apsides (ăp"sĭ*d&ē;z). See Apse. [L. apsis, absis, Gr. "apsi`s, "apsi^dos, a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, fr. "a`ptein to fasten.] 1. (Astron.) 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.
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2. (Math.) In a curve referred to polar co&ö;rdinates, any point for which the radius vector is a maximum or minimum.
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3. (Arch.) Same as Apse.
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