Apsis vs Arsis - What's the difference?
apsis | arsis |
(architecture) A recess or projection, with a dome or vault, at the east end of a church; an apse.
(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
Raising of the voice in prosody, accented part of a metrical foot