Let me try a little Ringworld history by rist establishing a few facts.
Ringworld 2.0
Radius: 149,604,905 km (92,960,000 miles)
Width: 1,609,347 km (1,000,000 miles)
Period of rotation: 8.838 days
Rotational speed: 4,431,599 km/hour (2,753,663 miles/hour); 1,231 km/sec (764.9 miles/second)
Angular speed: 40.733 degrees per day
Centrifugal Force: 0.976-g (due to Sun’s gravitational pull opposing centrifugal force)
Angular Size of the Sun: 0.53 degrees
Period of daylight: 12 hours
Period of darkness: 12 hours
Total length of day: 24 hours
Twilight: morning twilight begins at 5:49:24 am and ends at 6:10:36 am every day
Twilight: evening twilight begins at 5:49:24 pm and ends at 6:10:36 pm every day
Shadow Squares
Number of Shadow squares: 10
Radius of Shadow Square ring: 57,904,308 km (35,980,000 miles)
Period of rotation: 76 days
Rotational Speed: 199,303 km/hour (123,841 miles/hour) 27,037 kmph above orbital velocity (16,800 mph above orbital velocity)
Rotational Speed: 55.4 km/sec (34.4 miles/sec) 7.52 kmph above orbital velocity (4.67 mph above orbital velocity)
Angular speed: 4.733 degrees per day (0.642 degrees above rate at orbital velocity)
Relative angular speed of ringworld to shadow squares: 36 degrees per day
Angular Length of each shadow square: 18 degrees.
Angular length of gap between squares: 18 degrees.
The functional UPP Code for ringworld is:
Spica Sector
Ringworld 1414 A866E70-H S N No External Trade R 500 Non-aligned G2 V
For the ringworld, some of these digits require special intepretation:
A: The Ringworld has a class A starport, in that its capable of making repairs and even building all jump drive ships, but its location is not readily apparent. The starport is fully automated and their are 6 of them separated at intervals of 120 degrees along each rim wall, 3 on the north rimwall and 3 on the south. The Starport is staffed by robots who will try to seize any starship that lands there. PCs, if captured will be drugged, knocked out and placed on the ground of the ringworld environment and revived. When the PCs awaken, there are no robots in site. The robots meanwhile build android models of the PCs to crew the captured ships. The entity that controls the Ringworld's environment wishes theRingworld to remain a secret for the time being, they will uses PC android look alikes to infiltrate the OTU society in the Spica sector in order to spread some more of their non-detection viruses. If the PCs land somewhere else or don't find any of the starports, the robots will not interfere.
8: The environment is equivalent to standing on a size 8 (8,000 mile) diameter world with regards to simulated gravity, it is much bigger of course, the 8 only refers to the gravitational equivalent of a size 8 world.
6: The Ringworld has a standard atmosphere at 1,000 bar of pressure at sea level
6: The Ringworld has 60% hydrographics overall, though many of the continents are connected to each other and its possible in many places to walk from rimwall to rimwall without crossing an ocean.
E: The population is estimated to be 5 x 10 to the 14th power or E. Roughly the same population density as mideaval Europe the equivalent of population 7 for a size 8 world, this varies from place to place with wilderness areas in some places and more densely populated regions in others.
7: There is no single government and their are many many nations and kingdoms. The robots in the control center do not rule, they mostly just observe and don't interfere.
0: As there is no single government, there is no single law level so I place the digit 0 here.
H: The tech level of the robots is 17 or H, but the robots don't share this technology with the inhabitants, so this is not the tech level PCs will encounter unless they land at one of the starports.
S: There are scout bases here operated both by the robots, for observing the inhabitants and by the nations that exist here for exploring the ringworlds adjacent wilderness territories
N: There are naval bases here, the robots operate a naval base here with Tech level H starships, but they usually don't come out unless there is a dire emergency facing the Ringworld system. (A major invasion) but even a fleet carrier group doesn't warrent much of a response, the robots prefer to observe what happens. There are also other naval bases on the surface, but that is of the maglev and water navies operated by the living inhabitants
There is no external trade, the civilizations here don't have jump capable spaceships, maneuver drives, artificial gravity or grav vehicles. The have been isolated from the rest of the OTU for quite some time.
The star is a Sunlike G2 V spectrum star.