// Show sunrise and sunset for first 5 days of June in LA
func ExampleSunrise() {
var s sunrise.Sunrise
// Start time is June 1, 2013 PST
location, _ := time.LoadLocation("America/Los_Angeles")
startTime := time.Date(2013, 6, 1, 0, 0, 0, 0, location)
// Coordinates of LA are 34.05N 118.25W
s.Around(34.05, -118.25, startTime)
for s.Sunrise().Before(startTime) {
s.AddDays(1)
}
formatStr := "Jan 2 15:04:05"
for i := 0; i < 5; i++ {
fmt.Printf("Sunrise: %s Sunset: %s\n", s.Sunrise().Format(formatStr), s.Sunset().Format(formatStr))
s.AddDays(1)
}
// Output:
// Sunrise: Jun 1 05:44:01 Sunset: Jun 1 20:00:42
// Sunrise: Jun 2 05:43:45 Sunset: Jun 2 20:01:17
// Sunrise: Jun 3 05:43:30 Sunset: Jun 3 20:01:52
// Sunrise: Jun 4 05:43:17 Sunset: Jun 4 20:02:25
// Sunrise: Jun 5 05:43:05 Sunset: Jun 5 20:02:57
}
func TestDarkAllDay(t *testing.T) {
var s sunrise.Sunrise
location, _ := time.LoadLocation("America/Los_Angeles")
startTime := time.Date(2014, 12, 20, 0, 0, 0, 0, location)
// Above tropic of cancer should be dark all day
s.Around(68, -118.25, startTime)
dayLen := s.Sunset().Sub(s.Sunrise())
if dayLen != 0 {
t.Errorf("Expected dark all day, but light %v", dayLen)
}
dayOrNight, _, _ := sunrise.DayOrNight(68, -118.25, startTime)
if dayOrNight != sunrise.Night {
t.Error("Expected phase to be night")
}
}