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
apocentre primary pericentre
aphelion Sun perihelion
apastron starn periastron
apogee Yird perigee

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