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more about apsis
apsis |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Apsis \Ap"sis\ ([a^]p"s[i^]s), n.; pl {Apsides} ([a^]p"s[i^]*d[=e]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. 2. (Math.) In a curve referred to polar co["o]rdinates, any point for which the radius vector is a maximum or minimum. 3. (Arch.) Same as {Apse}. From WordNet r 1.6 [wn]: apsis n : a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the the altar [syn: {apse}]
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