perilune: meaning, definition, pronunciation and examples
Very low (C2/Technical)Highly technical/scientific; used almost exclusively in aerospace engineering, astronomy, and space mission contexts.
Quick answer
What does “perilune” mean?
The point in the orbit of an object (especially a spacecraft) around the Moon where it is closest to the Moon's surface.
Audio
Pronunciation
Definition
Meaning and Definition
The point in the orbit of an object (especially a spacecraft) around the Moon where it is closest to the Moon's surface.
The minimum altitude point in a lunar orbit, analogous to 'perigee' for Earth orbits. It is a critical parameter for mission planning, orbital mechanics, and ensuring safe clearance from lunar terrain.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Usage is identical in technical communities.
Connotations
Purely technical, with no cultural or regional connotations.
Frequency
Extremely rare in both varieties, confined to specialised discourse.
Grammar
How to Use “perilune” in a Sentence
The [spacecraft/orbiter] reached its perilune at [time/coordinates].The [mission plan] called for a perilune of [number] kilometres.Engineers adjusted the orbit to lower the perilune.Vocabulary
Collocations
Examples
Examples of “perilune” in a Sentence
noun
British English
- The probe's perilune was carefully monitored to avoid a crash.
- The calculation of the perilune required precise lunar gravity models.
American English
- Mission control confirmed a successful pass at perilune.
- The orbital insertion burn was timed for perilune.
Usage
Meaning in Context
Business
Not used.
Academic
Used in astrophysics, aerospace engineering, and planetary science papers discussing lunar orbital mechanics.
Everyday
Virtually never used.
Technical
The primary context. Used in mission control communications, trajectory analysis, and spacecraft operation manuals.
Vocabulary
Synonyms of “perilune”
Strong
Neutral
Weak
Vocabulary
Antonyms of “perilune”
Watch out
Common Mistakes When Using “perilune”
- Using 'perigee' for the Moon (perigee is Earth-specific).
- Pronouncing it as /pəˈraɪluːn/ (the stress is on the first syllable).
- Using it in non-lunar contexts.
FAQ
Frequently Asked Questions
Perilune is specific to orbits around the Moon. Perigee is specific to orbits around the Earth.
No, it is a highly specialised term used only in aerospace and astronomy contexts.
The opposite is 'apolune' (or 'lunar apoapsis'), which is the point in a lunar orbit farthest from the Moon.
No, it is exclusively a noun.
The point in the orbit of an object (especially a spacecraft) around the Moon where it is closest to the Moon's surface.
Perilune is usually highly technical/scientific; used almost exclusively in aerospace engineering, astronomy, and space mission contexts. in register.
Perilune: in British English it is pronounced /ˈpɛrɪluːn/, and in American English it is pronounced /ˈpɛrəˌluːn/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. The term is purely technical.”
Learning
Memory Aids
Mnemonic
PERI (close) + LUNE (moon, as in 'lunar') = the point closest to the Moon. Think of a 'periscope' looking at something near – here, it's the orbit near the Moon.
Conceptual Metaphor
THE ORBIT IS A PATH WITH HIGHS AND LOWS: Perilune is the 'valley' or 'low point' of the path around the Moon.
Practice
Quiz
What is the primary relationship of 'perilune'?