A direct port of suncalc javascript library (commit b08d1f6f8). Which means this port inherits the same accuracy and issues with the original javascript library.

Now SunCalc can handle polar region's "Mid-night sun". Errors are now embeded in SunCalc class:

SunCalc.SolarEventError.sunNeverRise
SunCalc.SolarEventError.sunNeverSet

SunCalc.LunarEventError.moonNeverRise(Date?) // An optional date for moonset time.
SunCalc.LunarEventError.moonNeverSet(Date?) // An optional date for moonrise time.

Location now become SunCalc.Location.

// DateFormatter
let formatter = DateFormatter()
formatter.dateStyle = .short
formatter.timeStyle = .short
formatter.timeZone = .current

// Sunrise and sunset
let sunCalc = SunCalc()
let now = Date()
let location = SunCalc.Location(latitude: 25.0, longitude: 120.0)
if let riseTime = try? sunCalc.time(ofDate: now, forSolarEvent: .sunrise, atLocation: location) {
    let sunrise = formatter.string(from: riseTime)
    print("Sunrise: \(sunrise)")
}
if let setTime = try? sunCalc.time(ofDate: now, forSolarEvent: .sunset, atLocation: location) {
    let sunset = formatter.string(from: setTime)
    print("Sunset: \(sunset)")
}

// Moon rise and moon set
let moonTimes = try? sunCalc.moonTimes(date: now, location: location)
if let moonTimes = moonTimes {
    print("Moonrise: \(formatter.string(from: moonTimes.moonRiseTime))")
    print("Moonset: \(formatter.string(from: moonTimes.moonSetTime))")
}

Moon rise and set time sometimes not correct. See Issue #1

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Copyright (c) 2018, Venj Chu

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