What planet takes 30 years to revolve?

Excuse me, but I was just wondering if you could clarify something for me. The paragraph mentions a planet that takes 30 years to revolve. Now, I'm curious as to which specific planet this might be referring to. Could you possibly enlighten me on the identity of this celestial body? It's quite an intriguing fact that I'm not familiar with, so I'd greatly appreciate it if you could shed some light on the matter.