Yours, Etc.: Origins and Uses of 8 Sign-Offs
late 14c., an astrological term, "relative position of the planets as they appear from earth" (i.e., how they "look on" one another); later also "way of viewing things," from Latin aspectus "seeing, looking, appearance," from past participle of aspicere "to look at," from ad- "to" (see ad-) + specere "to look" (see scope (n.1)). Meaning "the look one wears, the appearance of things" attested by early 15c.
aspect as·pect (ās'pěkt)
An appearance or look.
The side of an object that faces in a particular direction.