---
title: astronomicalDusk
framework: weatherkit
role: symbol
role_heading: Instance Property
path: weatherkit/sunevents/astronomicaldusk
---

# astronomicalDusk

The time of astronomical sunset, when the sun’s center is 18° below the horizon.

## Declaration

```swift
var astronomicalDusk: Date?
```

## Discussion

Discussion The sun no longer illuminates the sky, and does not interfere with astronomical observations. This property is optional because it’s possible for the sun to not set on a given day, at extreme latitudes.

## See Also

### Getting the sun events

- [astronomicalDawn](weatherkit/sunevents/astronomicaldawn.md)
- [civilDawn](weatherkit/sunevents/civildawn.md)
- [civilDusk](weatherkit/sunevents/civildusk.md)
- [nauticalDawn](weatherkit/sunevents/nauticaldawn.md)
- [nauticalDusk](weatherkit/sunevents/nauticaldusk.md)
- [solarMidnight](weatherkit/sunevents/solarmidnight.md)
- [solarNoon](weatherkit/sunevents/solarnoon.md)
- [sunrise](weatherkit/sunevents/sunrise.md)
- [sunset](weatherkit/sunevents/sunset.md)