Geosynchronous orbit. It's an orbit, 22,500 miles high above the equator. It has an orbital period of 24 hours so spacecraft there appear to be in a fixed point

Geosynchronous orbit. It's an orbit, 22,500 miles high above the equator. It has an orbital period of 24 hours so spacecraft there appear to be in a fixed point of the sky. It falls in the outer part of the Van Allen belts, coincidentally, so radiation there is much worse than it is either in lower orbits or in deep space.