system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the James Webb Space Telescope being launched from French Guiana?

Why is it advantageous to be closer to the equator for launch?
gpt
The equator is the point of greatest circumference perpendicular to the axis. This means that the surface of the Earth is moving fastest along this line, because it covers a greater distance in the same 24hr period. Starting with a greater velocity makes it easier to boost craft up to a speed that achieves a stable orbit. 

It may also be desirable for certain types of orbits as well.