---
title: lightyears
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/unitlength/lightyears
---

# lightyears

The light years unit of length.

## Declaration

```swift
@NSCopying class var lightyears: UnitLength { get }
```

## See Also

### Accessing Predefined Units

- [megameters](foundation/unitlength/megameters.md)
- [kilometers](foundation/unitlength/kilometers.md)
- [hectometers](foundation/unitlength/hectometers.md)
- [decameters](foundation/unitlength/decameters.md)
- [meters](foundation/unitlength/meters.md)
- [decimeters](foundation/unitlength/decimeters.md)
- [centimeters](foundation/unitlength/centimeters.md)
- [millimeters](foundation/unitlength/millimeters.md)
- [micrometers](foundation/unitlength/micrometers.md)
- [nanometers](foundation/unitlength/nanometers.md)
- [picometers](foundation/unitlength/picometers.md)
- [inches](foundation/unitlength/inches.md)
- [feet](foundation/unitlength/feet.md)
- [yards](foundation/unitlength/yards.md)
- [miles](foundation/unitlength/miles.md)