Apsidal motion
the rotation of the major axis of an eccentric orbit in the plane of the orbit.
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- Apsides
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. architecture. an apse. historical examples the two are joined by a diameter called the line of the apsides. the sailor’s word-book william henry smyth the line of […]
- 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. architecture. an apse. historical examples it does not span the apsis of a church; it spans rivers and valleys. beacon lights of history, volume v john lord […]
- Apsidiole
a small apse, especially one attached to a larger apse or a transept.
- Apsyrtus
a son of aeëtes, killed by his sister medea, who, while fleeing with jason, threw pieces of her brother’s body into the sea so that her father, in pursuing her, might be delayed while picking them up. historical examples how then by evil doom did she slay apsyrtus when he came to meet her? the […]
- Apt.
. abbreviation (pl) apts. apartment apartment