Function signSeparation

signSeparation(lon1: number, lon2: number): number
Calculate the sign separation between two longitudes.
Parameters
- lon1: number
  First ecliptic longitude in degrees
- lon2: number
  Second ecliptic longitude in degrees
Returns number
Sign separation (0-11)
Remarks
Used for detecting out-of-sign aspects. Returns the absolute sign difference (always positive).
Example
```
signSeparation(0, 90)     // 3 (Aries to Cancer)
signSeparation(0, 120)    // 4 (Aries to Leo)
signSeparation(350, 10)   // 0 (both in Pisces/Aries area)
```
- Defined in aspects/angular-separation.ts:223