apsidally

From apsidal + -ly.

apsidally (comparative more apsidally, superlative most apsidally)

1. (architecture) With regard to or by means of an apse or apses

   The roof was terminated apsidally.

2. (astrophysics) With regard to or in relation to an apsis, the point at which an orbiting object is at its minimum or maximum distance from the orbited object

   The planet's orbit is aspidally aligned with the dust disk.