A1P3S1I1S1
7 points
APSIS is validvalid
an apse [n APSIDES]
(Latin) the point at which a heavenly body is most or least distant from the centre of attraction [n APSIDES]
an apse [n APSIDES]
(Latin) the point at which a heavenly body is most or least distant from the centre of attraction [n APSIDES]