View source for Include Navigation and Orientation in Spin Habitats (IF)

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=== Navigation and Orientation in Spin Habitats ===
Life inside a rotating cylinder requires a local system of directions that reflects how gravity and movement actually work.
Traditional cardinal directions are meaningless inside a spin hab. Instead, residents use three axes of orientation: radial, circumferential, and axial.

;Transiting Between Rings — Inboard and Outboard
Larger habitats are often constructed as paired cylinders — two rings spinning in opposite directions to cancel torque.
These are known as the '''Inboard Ring''' and the '''Outboard Ring'''.
Moving between rings requires traveling through the non-rotating hub near the poles. This is called a '''Crossing'''.
Crossings can be disorienting, as Coriolis reflexes learned in one ring must be unlearned in the other.

;Axial Direction — Close and Away 
Each habitat has two endcaps known as '''poles'''. 
All axial directions use the poles as anchors.

* '''Open Pole''' — The public endcap. Main docks, Spin Pod berths, and visitor access are located here. This is the habitat’s primary fixed reference.
* '''Closed Pole''' — A restricted endcap used for administrative, technical, and military operations.

* '''Close''' — Toward the Open Pole. Also '''Astern''' in spacer slang.  
* '''Away''' — Toward the Closed Pole. Also '''Ahead'''.

This replaces “north/south” or “up/down the street” and is used constantly in daily navigation.

;Radial Direction — Up and Down
Spin gravity increases with distance from the core. As a result:

* '''Down''' — Toward the hull, into higher gravity.
* '''Up''' — Toward the core, into lower gravity.

Decks are numbered downward from the core:

: '''0''' — Central Core (microgravity)
: '''1''' — Open Air
: '''2''' — Garden Level
: '''3''' — Residential Level
: '''4''' — Industrial Level
: '''5''' — Shielding & Reserves

Sublevels use letters.  
Examples:  
: '''1:B''' — a platform or regrav station in the Open Air zone  
: '''2:D''' — a hilltop on the Garden Level  

Radial height is measured as a positive distance downward from the Core for convenience, even though “Up” leads toward the axis.

;Circumferential Direction — Spin and Anti 
In small habitats, Coriolis effects make Spin and Anti painfully intuitive. 
In larger habitats, signage and habit matter more than instinct.
Local signage may use block numbers instead of distances or degrees.
Along the ring, direction follows the habitat’s rotation:

* '''Spin''' — With the direction of rotation. Formally '''Spinward'''.  
* '''Anti''' — Opposite the direction of rotation. Formally '''Anti-Spinward''' or '''Counter-Spinward'''.

;Measurements may be:
* absolute degrees (“322° Spin”), taken from a marked Zero Line  
* relative degrees (“30° Anti from the elevator”)  
* ground distance (“Walk 2 km Spin”)  
* local block numbers

;Combined Directions 
These terms are used freely in speech.

: “She lives in Dogtown, 3 km Spin and 1 km Away from here.”  
: “Go Down to 1B, then 22° Spin and 2 km Close.”  
: “The regrav lab is Up to 0:A, two blocks Anti of the main shaft.”  
: “Maintenance corridor is 500 meters Away, then a short walk Spin.”

This system allows residents, spacers, and visitors to navigate a spin habitat as naturally as walking a city grid.