The great orrery in Moonglow, built after the gargoyle war, is truly an interesting piece of machinery. In theory it shows the relative positions of the moons and planets of the Britannian Solar System relative to its sun. However, a design flaw makes it useless. Despite the widespread knowledge that the planets, Britannia included, circle around the sun, the orrery tries to imply that they circle around Britannia!
So in the end the great orrery is more a monument to show how wrong conclusions can prevail even after being refuted.
Keeper of the orrery is Brion.