did you get the power turned on in the observatory? If you did, you should see a green light on the telescope controls when you adjust the coordinates. then when you press the button (where the green light is blinking) and the coordinates will reset.
If you haven't got the power turned on, this won't work. Go around the back of the telescopes to a little hall that runs behind the main control room. About 5 clicks in going either direction, you will find a device like a ship's wheel or a rotascope, with 2 levers, one vertical, one horizontal. Basically, you need to mess with the levers until the wheel lights up and starts turning. This puzzle randomizes from game to game, so there's no code to pass on. Just slowly adjust one lever until the wheel is as bright as you can make it. Then adjust the other until the wheel turns.
if this doesn't help, or is redundant information, post again and I'll see what I can do.
"So then he says it's enough to take aim! What's that supposed to mean?!?"