Orbital point
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orbital point</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for apsis that I've seen before include "point in orbit" , "part of church" , "The point of being close" , "astronomical point" .)