apsis ( synonym found)
Definition of apsis:

(n) : a recess or projection, with a dome or vault, at the east end of a church; an apse; 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
Definition of apsis:

(n) : a recess or projection, with a dome or vault, at the east end of a church; an apse; 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
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