An Etymological Dictionary of Astronomy and Astrophysics

The apparent position of a body in the Solar System relative to the Sun, as seen from Earth. The main aspects are conjunction, greatest elongation, opposition, and quadrature.

Etymology (EN): Aspect from L. aspectus “looking, view, appearance,”
p.p. of aspicere “to look at,” from ad- “to” + specere “to look,” cognate with Gk. skeptesthai “to examine, consider,”
Av. spas- “to watch, look,” Skt. spaz “to see, behold, look at;” PIE *spek- “to observe, look”.

Etymology (PE): Nemud from nemudan “to show, demonstrate, exhibit, appear”