Lagrange Point

(Last edited: Saturday, 30 September 2023, 10:17 PM)
Source: NOAA Images (2016, September 21). Lagrange Points. flickr.

Source: NOAA Images (2016, September 21). Lagrange Points. flickr.

Short Definition:

A Lagrange Point is a place where the gravitation force of two large masses (for example the earth and sun) addition together, so that a small object (for example a spacecraft or a telescope) can move with the two large masses on a path.

There are 5 different Lagrange points in total for each constellation.

Detailed Definition:

In the spot of a Lagrange point, the gravitational force by two large masses equal the centripetal force (the force that makes a body follow a curved path), which is required for the small mass to move along the two large masses and can reduce the fuel usage.

The Lagrange points L1,L2 and L3 are unstable, which can lead to an unwanted movement of the small mass away from the Lagrange point if a force is properly applied to the small mass. The Lagrange points L4 and L5 are stable.

The calculation is done by solving the three-body problem, where the Lagrange points are the constant solution for.


The word point originated from the Latin word pungere("to prick, pierce").

Sample Sentence(s):

"The Lagrange point L2 is the position of the James Webb Space Telescope."


French: PointdeLagrange

German: Lagrange-punkt

Polish: punkt Lagrange’a, punkt libracji

Swedish: Lagrangepunkt

Italian: punto di Lagrange

Links to Videos/Articles:

» Dictionary of Space Concepts