- L1, L2, and L3 are collinear Lagrange points in a two-body system. - For the Sun-Earth system, L1 and L2 are about 1.5 million km from Earth. - L3 is roughly 1 AU (approx 150 million km) from the Sun, on the opposite side of Earth. - The distance between L2 and L3 is approximately L2-Earth distance + Earth-Sun distance + Sun-L3 distance.