You have decided that very closely orbiting your city is a LUMINOUS PLANET, about which orbits a single MOON.
Orbiting much further from your city are FOUR PLANETS. None of these have satellites, you have decided. Yes, that makes sense, you think.
And on the southern wall, beyond an impenetrable veil of darkness, occupying the furthest orbit yet, there is an OMINOUS PLANET. A MOON circles this one too.
My world building sense is tingling. We’re going to visit these planets sooner or later.