L1 is the Lagrange point located approximately 1.5 million kilometers from Earth towards the Sun.
L2 is the Lagrange point located approximately 1.5 million kilometers from Earth in the direction opposite the Sun.
[citation needed] L3 is the Sun–Earth Lagrange point located on the side of the Sun opposite Earth, slightly outside the Earth's orbit.
Direct communication with spacecraft in this position is blocked by the Sun.
Minor planets in the L4 and L5 Sun–Neptune Lagrangian points are called Neptune trojans, with a lower-case t, as "Trojan asteroid" was originally defined as a term for Lagrangian asteroids of Jupiter.