A Flipper Zero app to calculate sunset and sunrise for today for many European cities.
The user first can choose country and then a city from a filtered list. The sunset, sunrise, and the daylight hours are immediately displayed.
The Splash Screen displays app title and version information, you can proceed with OK or exit.
The City Data Screen has two menu boxes, the country selector (with 2-letter ISO country codes) and the city selector. Based on the choices, the user sees:
- Capital Indicator icon appears for capital cities
- Latitude, longitude, elevation, and UTC offset
- Sunset, sunrise, and daylight hours
load_cities_from_csv()loads city data from external CSV filefilter_cities_by_country()filters city list based on selected countrydraw_callback()renders UI based on current screen and stateinput_callback()h andles button input events
The data file is located at /ext/apps_data/mitzi-astro/european_cities.txt (note the ending txt). It is in CSV with fields like country_code, utc_shift, city_name, longitude, latitude, elevation_m. It supports up to 200 cities (hard-coded, but easy to change).
Currently, a simplified formula is being used. The goal is to (real soon now) use the function SunTimes sun(int year, int month, int day, int lat_degree, int lat_minute, int lon_degree, int lon_minute, int height_meters, float time_zone_offset_to_utc_in_hours) located in suntimes.c to compute for any date between year 0 and 3000. The formulas are from https://gml.noaa.gov/grad/solcalc/calcdetails.html
- astronomical dawn and astronomical dusk,
- nautical dawn and nautical dusk,
- civil dawn and civil dusk,
- sunrise, sunset,
- day length,
The function returns a SunTimes, including a field comment reflecting special conditions (polar night or day!) or errors (non-existent dates during the 1582 Gregorian calendar reform).
- Mitzi (C. C. Odontoceti) was a movie star, born in 1958 and died in 1972.
- https://developer.flipper.net/flipperzero/doxygen/applications.html is the official (too) short introduction to writing own apps.
- An inspiring app to get acquainted with Flipper Zero is tuning fork, which is rather well documented, see https://github.com/besya/flipperzero-tuning-fork/tree/main
- Under https://github.com/flipperdevices/flipperzero-firmware/tree/dev/assets/icons/Common we find nice icons, e.g.
ButtonLeft_4x7.png. - You probably know: To compile the code, you need uFBT aka micro Flipper Build Tool, it requires python to be installed.