# Definitions of Lagrange points: $L_4$ and $L_5$ [duplicate]

We have the the five Lagrange points (let consider Earth and Sun):

• $L_1$ - lie between Sun and Earth;
• $L_2$ - beyond the Earth;
• $L_3$ - beyond the Sun;

And what's the difference between $L_4$ and $L_5$? Does they defined with the respect to rotation of Earth around the Sun?

The $L_4$ and $L_5$ points are positioned such that they are an equal distance away from both bodies (the Earth and the Sun in this case). They are chosen such that $L_4$ lies ahead of the smaller body in it's orbital path while the $L_5$ point is behind the smaller body in it's orbital path. See this article for more details.