Just thinking about this in relation to Hubble and the James Webb Space Telescope project.
Sending a telescope into orbit is a hell of a ride. No matter how well you calibrated on the ground, it would likely be out by the time you reach orbit, surely?
Do astronauts perform a final calibration before release? What if it goes out again during use?
Do they use inbuilt servos to calibrate from the ground?
Just curious if anyone knows the answer. Google doesn't seem to care about such trivial matters.
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Markus