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Definitions
periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth
Word origin
From French périgée via Latin perigeum, perigaeum, ultimately from Ancient Greek περί (perí, “near”) + γῆ (gê, “Earth”).
Used in a sentence
“Conjunctions of I and II [Io and Europa] occur when they are near perigee and apogee respectively; conjunctions of II and III [Europa and Ganymede] occur when II [Europa] is near perigee.”
“The resolution of the images obtained by this American probe [Messenger] will depend on its altitude [above Mercury] at any one time: about ten meters at perigee (200km altitude), but only one 1 km at apogee (15000km).”
“[Nereid’s] apogee—farthest point from Neptune—is five times the distance of its perigee—its closest point.”
Source: Wiktionary, CC BY-SA 4.0
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