Definition of aphelion in English:

aphelion

nounPlural aphelia apˈhiːlɪənəˈfiliən

Astronomy

The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
Mars is at aphelion
The opposite of perihelion
Example sentencesExamples
- Variations in the timing of perihelion and aphelion are caused by a ‘wobbling’ in the Earth's axis of rotation as it rotates around the Sun.
- There are small cyclic variations in those apparent sizes because the Earth-Moon distance changes as the latter moves between perigee and apogee, and the Earth-Sun separation alters as the former moves between perihelion and aphelion.
- Furthermore, any resonance with the Earth is illusory in that Mercury is not well placed for observations except during its brief greatest elongations near its aphelion.
- This is because at aphelion the planet is moving slowest, and consequently it is less likely to pass across the Sun during the critical window.
- This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present.

Origin

Mid 17th century: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph' hēlion 'from the sun'.

Definition of aphelion in US English:

aphelion

nounəˈfēlēənəˈfiliən

Astronomy

The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
Mars is at aphelion
The opposite of perihelion
Example sentencesExamples
- Variations in the timing of perihelion and aphelion are caused by a ‘wobbling’ in the Earth's axis of rotation as it rotates around the Sun.
- This is because at aphelion the planet is moving slowest, and consequently it is less likely to pass across the Sun during the critical window.
- This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present.
- There are small cyclic variations in those apparent sizes because the Earth-Moon distance changes as the latter moves between perigee and apogee, and the Earth-Sun separation alters as the former moves between perihelion and aphelion.
- Furthermore, any resonance with the Earth is illusory in that Mercury is not well placed for observations except during its brief greatest elongations near its aphelion.

Origin

Mid 17th century: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph' hēlion ‘from the sun’.

单词	aphelion
释义	Definition of aphelion in English: aphelion nounPlural aphelia apˈhiːlɪənəˈfiliən Astronomy The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. Mars is at aphelion The opposite of perihelion Example sentencesExamples Variations in the timing of perihelion and aphelion are caused by a ‘wobbling’ in the Earth's axis of rotation as it rotates around the Sun. There are small cyclic variations in those apparent sizes because the Earth-Moon distance changes as the latter moves between perigee and apogee, and the Earth-Sun separation alters as the former moves between perihelion and aphelion. Furthermore, any resonance with the Earth is illusory in that Mercury is not well placed for observations except during its brief greatest elongations near its aphelion. This is because at aphelion the planet is moving slowest, and consequently it is less likely to pass across the Sun during the critical window. This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present. Origin Mid 17th century: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph' hēlion 'from the sun'. Definition of aphelion in US English: aphelion nounəˈfēlēənəˈfiliən Astronomy The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. Mars is at aphelion The opposite of perihelion Example sentencesExamples Variations in the timing of perihelion and aphelion are caused by a ‘wobbling’ in the Earth's axis of rotation as it rotates around the Sun. This is because at aphelion the planet is moving slowest, and consequently it is less likely to pass across the Sun during the critical window. This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present. There are small cyclic variations in those apparent sizes because the Earth-Moon distance changes as the latter moves between perigee and apogee, and the Earth-Sun separation alters as the former moves between perihelion and aphelion. Furthermore, any resonance with the Earth is illusory in that Mercury is not well placed for observations except during its brief greatest elongations near its aphelion. Origin Mid 17th century: alteration of modern Latin aphelium (by substitution of the Greek inflection -on), from Greek aph' hēlion ‘from the sun’.
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