4. Position or situation with regard to seeing; that position which enables one to look in a particular direction; position in relation to the points of the compass; as, a house has a southern aspect, that is, a position which faces the south.
6. (Science: astronomy) The situation of planets or stars with respect to one another, or the angle formed by the rays of light proceeding from them and meeting at the eye; the joint look of planets or stars upon each other or upon the earth.
The aspects which two planets can assume are five; sextile, when the planets are 60 deg apart; quartile, or quadrate, when their distance is 90 deg or the quarter of a circle; trine, when the distance is 120 deg; opposition, when the distance is 180 deg, or half a circle; and conjunction, when they are in the same degree. Astrology taught that the aspects of the planets exerted an influence on human affairs, in some situations for good and in others for evil.