Coriopolis uses the standard gyrealm geographic coordinate system, adapted to the specific geometry of its 80-kilometer-long cylinder. Understanding this local implementation is essential for navigation, addressing, and environmental management within the habitat.

North–South Directions#

The north–south axis is aligned with the rotation axis of the cylinder. The north end is determined by the right-hand rule: curling the fingers of the right hand in the direction of Coriopolis’s rotation points the thumb toward the north end. The south end is the opposite end of the rotation axis. This alignment is consistent throughout the length of the cylinder, providing a reliable reference for axial navigation.

East–West Directions#

East–west directions follow the curvature of the cylinder. East is the direction of rotation; west is against it. This cylindrical analogue of latitude is consistent with inhabitants’ direct perception of the habitat’s rotation.

Zero Point#

The origin of the Coriopolis coordinate system is at the midpoint between the two ends of the cylinder, 40 kilometers from either end-cap.

Coordinate Notation#

Coordinates are expressed as a combination of axial (north–south) and circumferential (east–west) positions, with an optional level coordinate for vertical displacement from the main level. For example, a specific point might be described as being “20 kilometers north and 5 kilometers east of the origin.”

Application#

This coordinate system underpins urban planning, environmental management, transit, logistics, and everyday navigation in Coriopolis. Local convention numbers main-level structures at level zero, with upper levels positive and subsurface levels negative, consistent with the broader gyrealm standard.