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Apse vs. Apsis

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Apsenoun

(architecture) A semicircular projection from a building, especially the rounded east end of a church that contains the altar.

Apsisnoun

(architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.

Apsenoun

The bishop's seat or throne in ancient churches.

Apsisnoun

(astronomy) Either of the points in the elliptical orbit of a planet or comet where it is closest or furthest from the sun; perihelion or aphelion; an apside

Apsenoun

A reliquary, or case in which the relics of saints were kept.

Apsisnoun

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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Apsenoun

The nearest and furthest points to the centre of gravitational attraction for a body in orbit. More usually called an apsis.

Apsisnoun

In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.

Apsenoun

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.

Apsisnoun

Same as Apse.

Apsenoun

A reliquary, or case in which the relics of saints were kept.

Apsisnoun

a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar

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Apsenoun

a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar

Apsis

An apsis (from Ancient Greek ἁψίς (hapsís) 'arch, vault'; pl. apsides AP-sih-deez) is the farthest or nearest point in the orbit of a planetary body about its primary body.

Apse

In architecture, an apse (plural apses; from Latin absis 'arch, vault' from Ancient Greek ἀψίς apsis 'arch'; sometimes written apsis, plural apsides) is a semicircular recess covered with a hemispherical vault or semi-dome, also known as an exedra. In Byzantine, Romanesque, and Gothic Christian church (including cathedral and abbey) architecture, the term is applied to a semi-circular or polygonal termination of the main building at the liturgical east end (where the altar is), regardless of the shape of the roof, which may be flat, sloping, domed, or hemispherical.

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