This app is an alarm which notifies at dawn, sunrise, sunset and dusk. If you would like to begin activity soon after sunrise, the app is most suitable. The app can confirm sunrise, sunset, dawn and dusk on a current position and main cities immediately. And you can check time of the dawn, the dusk, the sunrise and the sunset even if you do not allow local notifications.

The app is using Japanese dawn and dusk which established by a samurai (a shogunate employee), but there are almost the same civil twilight. The civil twilight begins and ends when the geometric center of the sun is 6° below the horizon. However, the dawn begins and the dusk ends when the geometric center of the sun is 7.3611° below the horizon. If turn on the civil twilight switch, the dawn and the dusk will be civil dawn and civil dusk.

■ Exemption from Liability

ASTI will not be held liable for anything that transpires as a result of using this information. No liability whatever will be accepted for any damage, injury or loss that may be suffered as a result of using the app.

What's New

Version 1.4.2

- Supported iOS 12.
- Added a function which can set number of alarm times.

Ratings and Reviews


Generally like, but.....

I want to be able to adjust the number of notifications I get at each dawn and dusk. If this is possible, I can’t find it. While I can figure most functions out, it is not all that intuitive. Better explanations of the Burris would help.

Developer Response

Please download the latest version and tap Dawn/Sunrise/Sunset/Dusk. You can set a number of alarms at the bottom of a settings screen. The alarm is 30 seconds per one time.

ابو فهد سماحه

One of a kind alarm clock.

I have been looking for an alarm app that works with the dawn , I downloaded a couple but none of them worked like this one for many reasons, like u can actually change by adding or subtracting minutes and it works without having the app on front.


Grateful for this app

This app is very helpful. I don't know any other app that works this well. Thank you for making improvements. If I was able to choose the days that I want the the alarm to go off then that would be perfect.


Takafumi AMANO
19.7 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Japanese
Age Rating
Rated 4+
© 2015-2018 ASTI


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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