30 hours = one Ringworld day
1 Ringworld rotation = 7½ days
75 days = 10 turns = 1 falan
Mass = 2 x l0exp30 grams
Radius = .95 x l0exp8 miles
Circumference = 6 x l0exp8 miles
Width = .997 x l0exp6 miles
Surface area = 6 x l0exp14 square miles = 3 million times the surface area of the Earth
Surface gravity = .992 G (spin)
Spin velocity = 770 miles/second
Rim walls rise inward, 1000 miles.
Star: G3 verging on G2, barely smaller and cooler than Sol
Recent arrivals
Louis Wu: Earth born. First and second Ringworld expeditions.
Teela Brown: Earth born, of a line bred for luck by Piersons puppeteer manipulation. Turned protector in The Ringworld Engineers, and now deceased. First Ringworld expedition.
Nessus: Piersons puppeteer, the Hindmosts partner and mate. Led the first Ringworld expedition.
The Hindmost: Piersons puppeteer, once Chief-in-Command of his species. Led the second Ringworld expedition.
Chmeee, once Speaker-to-Animals: Kzin. First and second Ringworld expeditions.
Roxanny Gauthier: Earth born, Detective-One in the ARM. Served aboard Snail Darter and Gray Nurse.
Oliver Forrestier: Wunderland born, Detective, ARM. Served aboard Snail Darter and Gray Nurse.
Claus Raschid: Earth born, Detective-Two, ARM. Served aboard Snail Darter and Gray Nurse.
Detective-Major Schmidt: Earth born. Served aboard Gray Nurse.
Wes Carlton Wu: Earth born, Flight Captain aboard Koala.
Tanya Haynes Wu, Earth born, Purser aboard Koala.
Ringworlds children
Seeker: species unknown, last seen with Teela Brown.
Acolyte: Kzin, Chmeees exiled son.
Bram: Vampire turned protector, ruler of the Repair Center for countless aeons until killed by Tunesmith with Louis Wus help.
Wembleth: species unknown, Ringworld-born traveler.
Tunesmith: Night Person (Ghoul) turned protector.
Kazarp: Night Person, Tunesmiths son.
Hanuman: Hanging Person turned protector.
Valavirgillin: Machine People, represents Farsight Trading.
Proserpina: surviving Pak protector.
The Penultimate: Pak protector, long dead.
Szeblinda: Hinsh. Giraffe People
Kawaresksenjajok: City Builder
Fortaralisplyar: City Builder