I just got thru reading Brynhildr in the Darkness for the first time after putting it off for so long.

Thing that has been bugging me, is the observatory in it. I think I watched a different anime with one in it? I am not sure if I watched the Brynhildr in the Darkness anime back in the day. The episodes I watch to check weren't ringing the right bells.

My question, is there another anime that has the character meet or group up at an observatory or something similar? Or did I watch this anime and forgot most of it?