Apocenter – Definition & Meaning

The term apocenter, also known as apoapsis, is widely used in astronomy and astrophysics. It is a crucial concept that describes the farthest point of an object’s orbit from its center of attraction. In this article, we will explore the definition, origin, meaning in different dictionaries, associations, synonyms, antonyms, and example sentences of apocenter.

Definitions

The apocenter is defined as the point in an elliptical orbit where the distance between the orbiting object and its center of attraction is at its maximum. It is the opposite of the pericenter, which is the closest point of an object’s orbit to its center of attraction.

Origin

The term apocenter is derived from the Greek words “apo,” which means away from, and “kentron,” which means center. The word was first used in the early 19th century by astronomers to describe the farthest point of an object’s orbit.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, apocenter is defined as “the point in an orbit most distant from the center of attraction.” The Oxford dictionary defines it as “the point in an orbit of a celestial body at which it is furthest from the body it is orbiting.”

Associations

The concept of apocenter is associated with the study of planetary orbits, comets, and other celestial bodies. It is used to calculate the distance between objects in space and to determine the shape of their orbits.

Synonyms

The synonyms of apocenter include apoapsis, far point, and furthest point.

Antonyms

The antonyms of apocenter include pericenter, closest point, and nearest point.

The same root words

The same root words as apocenter include apogee, which is the farthest point of an object’s orbit around the Earth, and aphelion, which is the farthest point of an object’s orbit around the Sun.

Example Sentences

1. The spacecraft reached its apocenter and started its descent towards the planet.
2. The comet’s apocenter is located far beyond the orbit of Pluto.
3. The distance between the Earth and the Moon is shortest at the pericenter and longest at the apocenter.
4. The elliptical orbit of Mars has an apocenter of 249.2 million kilometers from the Sun.
5. The apocenter of a hyperbolic orbit is infinite, as the object never returns to its center of attraction.