Technical
Lagrange Point
One of five positions in a two-body system where gravitational and centrifugal forces balance, allowing a spacecraft to maintain a relatively stable position.
Lagrange points (L1–L5) are equilibrium locations in the rotating frame of two large bodies, such as the Sun and Earth, where a small object can hold a near-fixed position relative to them.
L1 and L2 of the Sun–Earth system are valued for solar observation and deep-space astronomy respectively, though they require small station-keeping manoeuvres because L1, L2, and L3 are only quasi-stable. They sit outside conventional Earth-orbit regimes and raise distinct tracking and coordination questions.