import net.time4j.ClockUnit; import net.time4j.PlainDate; import net.time4j.SystemClock; import net.time4j.calendar.astro.DefaultSunriseCalculator; public class Example { public static void main(String[] args) { SystemClock.setCurrentTimeSystem(); PlainDate today = PlainDate.nowInSystemTime(); DefaultSunriseCalculator sunriseCalculator = DefaultSunriseCalculator.ofLocation(37.7749, -122.4194); long sunriseTime = sunriseCalculator.computeSunriseTime(today); System.out.println("Today's sunrise time at (37.7749, -122.4194) is: " + sunriseTime); } }