[ ăp′ō-ăp′sĭs ]
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Plural apoapsides (ăp′ō-ăp′sĭ-dēz′)
The point at which an orbiting object is farthest away from the body it is orbiting. This point is sometimes given a name that is specific to the body being orbited. For example, the apoapsis of an object orbiting Earth is its apogee (from gaia, the Greek word for Earth), and the apoapsis of an object orbiting the Sun is its aphelion (from hēlios, the Greek word for Sun). According to Kepler's laws of planetary motion, an object is at its lowest velocity at the apoapsis. Compare periapsis.
ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
Words nearby apoapsis
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.