ALL meanings of lower apsis
low·er ap·sis
L l - noun lower apsis See under apsis (def 1). 1
- noun plural lower apsis Astronomy. either of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction. 1
- noun plural lower apsis Architecture. an apse. 1