Sky science
Lagrange Point
Direct answer
Lagrange Point: A Lagrange Point is one of five locations where a small body can maintain a repeating position in a rotating two-body system.
It is a special equilibrium region labeled L1 through L5.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Orbital Resonance, Mean Motion Resonance, Hill Sphere, Roche Limit
It is a special equilibrium region labeled L1 through L5.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Lagrange Point
Lagrange analyzed the restricted three-body problem in the eighteenth century.
A one-minute story
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Why Lagrange Point matters
These regions support spacecraft operations and stable Trojan populations.
Lagrange Point in practice: an example
The James Webb Space Telescope follows a halo orbit associated with Sun-Earth L2.
Where readings of Lagrange Point go wrong
L1, L2, and L3 require station keeping; they are not effortless parking places.
Sources and editorial method
Research references used for this entry include:
- NASA Science: What Are Lagrange Points? - NASA reference for the five equilibrium regions in a rotating two-body system.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
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Common questions
What is a Lagrange Point?
A Lagrange Point is one of five locations where a small body can maintain a repeating position in a rotating two-body system.
What do people get wrong about a Lagrange Point?
L1, L2, and L3 require station keeping; they are not effortless parking places.
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