The hardware and engineering to make a hovering a rocket is amazing. But the control theory behind the hover is just not that tricky - It's very similar to hove

The hardware and engineering to make a hovering a rocket is amazing. But the control theory behind the hover is just not that tricky - It's very similar to hovering a quad copter. If you had a JavaScript rocket simulator, with clean position, rotation, and velocity data, you could probably code a hover in five or six lines. Now it's not quite that easy in practice, but the theory is still simple. The Apollo lunar modules were capable of hovering, using only a portion of a 0.001Ghz 16 bit computer.