the.com/lagrange point
the five spots in space where gravity does the math so your fuel tank doesn't have to.
means a location where the gravitational pull of two large bodies and a spacecraft's orbital motion balance out, letting the small object stay put relative to both.
from named after joseph-louis lagrange, who in 1772 solved the three-body problem for special cases while euler had already found three of the five points earlier — lagrange got the naming rights anyway.
countfive points exist per orbital pair, only two are stable
webb telescopeparked at l2, 1.5 million km from earth
trojan asteroidsjupiter hoards thousands at its l4 and l5
stability trapl1 through l3 require constant tiny corrections