Пример скетча Arduino

#include <RiseSet.h>
float srise;
float sset;
float lat = 53.86;
float lon = 33.66;

//date Nov 5 2015
int day = 5;
int month = 11;
int year = 2015;

float zenith = 90.83;   // offical: 90 degrees 50 ' = 90.83
                        // civil: 96 degrees
                        // nautical: 102 degrees
                        // astronomical: 108 degrees
int tz = 3;

RiseSet sun;

void setup() {
    Serial.begin(9600);
    while (!Serial.available()) {
    //wait
    }
}

void loop() {

  srise = sun.sunrise(lat, lon, month, day, year, zenith, tz);
  sset = sun.sunset(lat, lon, month, day, year, zenith, tz);
  Serial.print("Sunrise time: "); Serial.println(srise);
  Serial.print("Sunset time: "); Serial.println(sset);
  delay(5000);

}

Download: RiseSet.h