Ahhh, you need the the good one. I heard just recently the speed of the earth rotation has increased and impacted time. Not sure about the accuracy of that, but I'd think that would mean all telescopes are now off even with those thingies (I have no idea what they are called, but I know what you mean).
Imagine a city of 14 million + a good telescope, yeah, I'd be in trouble.
I think it's an azimuth something or other. I am not sure if you call assist them so if the earth's spin has changed too much they will make a killing selling new ones!!
It is an azimuth and I didn't know that word. Yes, they'll make a killing (best corporate practice) on new ones. Back in 2011, the direction of north changed slightly, Inuit way up north tracked this with how they tell the time of day, if I'm recalling correctly, it's using the shadows from snow drifts. If time has now recently shortened (still don't know where I heard about this), that really makes navigating a mess, lol.