So, I'm in the planetarium. I can tell by the map there is an entrance to a secret room here.
I noticed that the different planets have ingrained numbers on them:
Purple planet: 1
Earth: 3, both symbol versions of it,
Sun: 4, both symbol versions of it
I assume I have to wait for the planets to align in rising order, but is there anything more to it than that? AFAIS, I can't interact with the gears on which the planets spin or anything. Could someone point me in the right direction?