Blue Hour (Solar Calculator)

Blue Hour (Solar Calculator)

The Blue Hour describes a period of dawn and dusk, when the sky is colored specially which is very interesting for photography.
The duration and timing of the Blue Hour varies depending on location and on the date. In order to achieve optimum results and to plan in advance the app Blue Hour (solar calculator) has been developed.

The calculations are not only limited to the blue hour. Further information for sun and moon events can also be calculated. This includes information about sunrise, sunset together with data of the blue hour, golden hour and twilight times (civil, nautical and astronomical). Furthermore you can calculate information about moonrise, moonset and moon phases (calculated data are approximations of +/- 1 day accuracy).

In this app you can view data for multiple locations. These can be defined manually or automatically by getting your GPS location. Additionally you have the opportunity to manually set timezones of the locations, which can be helpful if you are planning trips to locations with another timezone than the one, where you currently are in.

Core features at a glance
Calculation of sunrise, sunset and solar noon
Calculation of moonrise and moonset + moonphase
Calculation of civil blue hour
Calculation of twilight times (civil, nautical and astronomical)
Calculation of golden hour
Visualization of the azimuth-data of sunrise, sunset, moonrise and moonset
Visualization of the azimuth-data of sun and moon for specific time
5 days weather prediction
definition of multiple locations, including current position (based on GPS)
monthly forecast
export of forecast-data to Excel-tables
reminder for events
homescreen widget


Note: the calculated values are approximations to plan your photography trips. Additionally it depends on weather situation, how good or if the blue or golden hour is visible.


v3.10 (July 2018)
* fix forced time format issue in map view
* add option to change map type directly in map view
* some smaller bugfixes and performance improvements

Want to help translate this app into your language? Just get in contact to me!


  • Blue Hour (Solar Photography Calculator) Screenshot
  • Blue Hour (Solar Photography Calculator) Screenshot


Blue Hour (Solar Calculator) v3.10.3 [Patched] / Mirror