Ringworld Seasons "It is always summer on ringworlds but the plants have their flowers. Think of it as early summer." I could not be satisfied with this. After mulling over several possible ways to induce seasons on a ringworld, I settled for modulating the day length as follows. Shadow panels now modulate the width of the sunlight gap, down to half the normal day length in winter. This is done continuously around the ringworld so all four seasons are present all the time, each in a different quadrant of the ringworld. When a stargate is opened the shadow panels retract to their summer configuration, with maximum aperture. This means you can no longer look up to see when the shadow panels are in position to open a stargate. Instead the obelisks at the corners now show a light at the top when the shadow panels are in position to open a stargate. The Control Center story chapter was updated to impart this information. Ringworld Shadow Panel Connecting Cables The shadow panels orbit independently of each other. They should be interconnected to give them a coherent structure. Cables were added at the corners to connect adjacent shadow panels. These "cables" appear to be very thin; they are 90m in diameter. They look as thin as hairs on the statue at the control center if you actually see them. Potted Plant Growth Potted plants should grow. Potted plants now start as a tiny seedling. The plant grows to full size in 5 minutes for ground cover, 10 minutes for shrubs, and 20 minutes for trees. They flower at that time. That is also the first time the plant can be harvested. A potted plant can be harvested every 10 minutes after that. Tropical and Polar Latitudes Tropical and polar latitude calculations should consider axial tilt. Current calculation is still a holdover from before worlds had axial tilt. Done. This will affect existing worlds. Atmosphere Density Description Improve atmosphere description with some adjectives at key transitions. Atmosphere density description now includes these terms. This only applies to worlds in the inner, habitable, and outer orbit zones. Frigid and inferno atmospheres are never breathable or ok for plants.

• Vacuum = 0% density, not breathable, no plants
• Trace = 1% to 9%, not breathable, no plants
• Very Thin = 9% to 14%, not breathable, plants ok
• Thin = 15% to 39%, breathable but not good enough for a homeworld, plants ok
• No density term = 40% to 70%, breathable, plants ok
• Thick = 71% to 85%, breathable but not good enough for a homeworld, plants ok
• Oppressive = 86% to 100%, too much pressure to breath, plants ok

• Suns - Axial Tilt, Orbital Period for companions.
• Spherical Worlds - Axial Tilt if not a planetoid, Orbital Period, Rotation Period if not a planetoid
• Ringworlds - Orbital Period, Day Period