Apsis

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The apsides indicate the nearest an furthest pynts o an orbitin bouk aroond its host.
(1) farthest(3) focus(2) nearest
apocentreprimarypericentre
aphelionSunperihelion
apastronstarnperiastron
apogeeYirdperigee

An apsis (Greek: ἁψίς; plural apsides, Greek: ἁψίδες) is an extreme pynt in an object's orbit.