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apsis n. 近[远] 日点 近[远] 日点 apsis n 1: a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar [ synonym: { apse}, { apsis}] Apse \ Apse\ ([ a^] ps), n.; pl. Apses ([ a^] p" s[ e^] z). [ See { Apsis}.] 1. ( Arch.) ( a) A projecting part of a building, esp. of a church, having in the plan a polygonal or semicircular termination, and, most often, projecting from the east end. In early churches the Eastern apse was occupied by seats for the bishop and clergy. Hence: ( b) The bishop' s seat or throne, in ancient churches. [ 1913 Webster] 2. A reliquary, or case in which the relics of saints were kept. [ 1913 Webster] Note: This word is also written { apsis} and { absis}. [ 1913 Webster]
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. [ 1913 Webster] 2. ( Math.) In a curve referred to polar co[" o] rdinates, any point for which the radius vector is a maximum or minimum. [ 1913 Webster] 3. ( Arch.) Same as { Apse}. [ 1913 Webster]
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