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perihelion: meaning, definition, pronunciation and examples

C2 / Very Rare / Technical
UK/ˌpɛrɪˈhiːlɪən/US/ˌpɛrəˈhiːliən/

Technical / Scientific / Academic

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Quick answer

What does “perihelion” mean?

the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

Audio

Pronunciation

Definition

Meaning and Definition

the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun

Used metaphorically to indicate the point of closest approach or maximum intensity in any cyclical or orbital system.

Dialectal Variation

British vs American Usage

Differences

No significant difference in meaning or usage. Spelling and pronunciation are consistent.

Connotations

Technical precision in both varieties. No cultural or connotative divergence.

Frequency

Extremely low frequency in general discourse. Exclusive to scientific/technical contexts in both regions.

Grammar

How to Use “perihelion” in a Sentence

The [celestial body] reaches/approaches/passes perihelion on [date].At perihelion, the [celestial body] is [distance] from the sun.

Vocabulary

Collocations

strong
reach perihelionat perihelionperihelion passageperihelion distance
medium
calculate the periheliondate of perihelionvelocity at perihelion
weak
earth's perihelioncomet's perihelionnear perihelion

Examples

Examples of “perihelion” in a Sentence

noun

British English

  • The comet will make its perihelion passage in January.
  • Kepler's laws describe how a planet's speed increases at perihelion.

American English

  • The spacecraft's instruments were calibrated for the perihelion encounter.
  • Calculating the exact moment of perihelion requires precise orbital data.

Usage

Meaning in Context

Business

Not used.

Academic

Used in astronomy, astrophysics, and related physical sciences.

Everyday

Virtually never used. Would be considered highly esoteric.

Technical

Standard term in orbital mechanics and astronomy for specifying orbital characteristics.

Vocabulary

Synonyms of “perihelion”

Neutral

closest approach (to the sun)

Weak

periapsis (general term for closest approach to a primary body)

Vocabulary

Antonyms of “perihelion”

aphelion

Watch out

Common Mistakes When Using “perihelion”

  • Mispronouncing as /ˈpɜːrɪhɛliən/.
  • Misspelling as 'perihilion' or 'perihelian'.
  • Using it to mean any closest point, without the solar context in technical writing.

FAQ

Frequently Asked Questions

'Perihelion' refers specifically to the closest point to the sun. 'Perigee' refers to the closest point to Earth.

Earth reaches perihelion once every year, usually around early January.

Technically, no. The correct term for the closest point to any star is 'periastron'. 'Perihelion' is specific to our solar system.

No, it is a highly specialized scientific term rarely encountered outside astronomy, astrophysics, or advanced science writing.

the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

Perihelion is usually technical / scientific / academic in register.

Perihelion: in British English it is pronounced /ˌpɛrɪˈhiːlɪən/, and in American English it is pronounced /ˌpɛrəˈhiːliən/. Tap the audio buttons above to hear it.

Learning

Memory Aids

Mnemonic

PERIhelion: PERIphery of the sun? No, the opposite! Think 'PERI' as in 'near' (from Greek) + 'HELIOS' (sun) = near the sun.

Conceptual Metaphor

THE CLOSEST POINT IS A PEAK OF INTENSITY (e.g., 'The debate reached its perihelion of hostility before cooling down.')

Practice

Quiz

Fill in the gap
A planet moves fastest in its orbit when it is at .
Multiple Choice

Which of the following best defines 'perihelion'?

perihelion: meaning, definition, pronunciation and examples | Lingvocore