Urania had been watching the clouds and now checked her watch. "Dusk is hitting soon, fourteen minutes approximately." She moved to her telescope. "We should already be able to just make out the comet now, but the best view will be in-" she did the maths for a few seconds. "Twenty-seven minutes. Or, should be, but these clouds might keep obstructing."
A once in a lifetime opportunity - even for an immortal such as Urania - and clouds were going to get in the way.