4 |
5 |
6 |
7 |  [](https://github.com/Sunlitt/SunKit/stargazers) [](https://github.com/Sunlitt/SunKit/issues) [](https://developer.apple.com/documentation/corelocation) [](https://swiftpackageindex.com/Sunlitt/SunKit) [](https://swiftpackageindex.com/Sunlitt/SunKit)
8 |
9 |
](https://apps.apple.com/app/sunlitt/id1628751457)
16 |
17 | ## Attribution
18 | SunKit is licensed under the Apache License 2.0. For attribution, we request that you include an unmodified vector of SunKit's logo, available [here](Resources/sunkit.svg), along with our organization name "Sunlitt", both at legible sizes, and that they link back to our [website](https://sunlitt.app).
19 |
20 | If you are developing an app for Apple platforms, we additionally request that you include SunKit's license and copyright in the "Acknowledgments" section of your app's Settings.bundle file. We have included a Settings.bundle example [here](Resources/Settings.bundle) for you to download and import as is in your Xcode project.
21 |
22 | Attribution is essential to make sure that our hard work is properly recognized and we thank you for complying with our requests.
23 |
24 |
25 | ## Usage
26 | **CoreLocation framework is required for SunKit to work**. SunKit only needs a location and the relative time zone. Everything is computed locally, no internet connection is needed.
27 |
28 | ### Creating a Sun
29 |
30 | ```swift
31 |
32 | // Creating a CLLocation object with the coordinates you are interested in
33 | let naplesLocation: CLLocation = .init(latitude: 40.84014, longitude: 14.25226)
34 |
35 | // Timezone for the location of interest. It's highly recommended to initialize it via identifier
36 | let timeZoneNaples: Timezone = .init(identifier: "Europe/Rome") ?? .current
37 |
38 | // Creating the Sun instance which will store all the information you need about sun events and his position
39 | var mySun: Sun = .init(location: naplesLocation, timeZone: timeZoneNaples)
40 |
41 | ```
42 |
43 | ### Retrieve information
44 |
45 | ```swift
46 | // Creating a Date instance
47 | let myDate: Date = Date() // Your current date
48 |
49 | // Setting inside mySun object the date of interest
50 | mySun.setDate(myDate)
51 |
52 | // All the following informations are related to the given location for the date that has just been set
53 |
54 | // Azimuth of the Sun
55 | mySun.azimuth.degrees
56 |
57 | // Altitude of the Sun
58 | mySun.altitude.degrees
59 |
60 | // Sunrise Date
61 | mySun.sunrise
62 |
63 | // Sunset Date
64 | mySun.sunset
65 |
66 | // Evening Golden Hour Start Date
67 | mySun.eveningGoldenHourStart
68 |
69 | // Evening Golden Hour End Date
70 | mySun.eveningGoldenHourEnd
71 |
72 | // To know all the information you can retrieve go to the **Features** section.
73 |
74 | ```
75 |
76 |
77 | ### Working with Timezones and Dates
78 | To properly show the Sun Date Events use the following DateFormatter.
79 |
80 | ```swift
81 |
82 | //Creting a DateFormatter
83 | let dateFormatter = DateFormatter()
84 |
85 | //Properly setting his attributes
86 | dateFormatter.locale = .current
87 | dateFormatter.timeZone = timeZoneNaples // It shall be the same as the one used to initilize mySun
88 | dateFormatter.timeStyle = .full
89 | dateFormatter.dateStyle = .full
90 |
91 | //Printing Sun Date Events with the correct Timezone
92 |
93 | print("Sunrise: \(dateFormatter.string(from: mySun.sunrise))")
94 |
95 | ```
96 |
97 | ## Features
98 | * Sun Azimuth
99 | * Sun Altitude
100 | * Civil Dusk Time
101 | * Civil Dawn Time
102 | * Sunrise Time
103 | * Solar Noon Time
104 | * Solar Midnight Time
105 | * Morning Golden Hour Time
106 | * Evening Golden Hour Time
107 | * Sunset Time
108 | * Astronomical Dusk
109 | * Astronomical Dawn
110 | * Nautical Dusk
111 | * Nautical Dawn
112 | * Morning Blue Hour Time
113 | * Evening Blue Hour Time
114 | * Sun Azimuth at Sunrise
115 | * Sun Azimuth at Sunset
116 | * Sun Azimuth at Solar Noon
117 | * Total Daylight Duration
118 | * Total Night Duration
119 | * March Equinox
120 | * June Solstice
121 | * September Equinox
122 | * December Solstice
123 |
124 |
125 | ## References
126 |
127 | * NOAA Global Monitoring Division. General Solar Position Calculations: [Link](https://gml.noaa.gov/grad/solcalc/solareqns.PDF).
128 | * PV Education: [Link](https://www.pveducation.org).
129 | * Celestial Calculations: A Gentle Introduction to Computational Astronomy: [Link](https://www.amazon.it/Celestial-Calculations-Introduction-Computational-Astronomy/dp/0262536633/ref=sr_1_1?__mk_it_IT=ÅMÅŽÕÑ&crid=1U99GMGDZ2CUF&keywords=celestial+calculations&qid=1674408445&sprefix=celestial+calculation%2Caps%2C109&sr=8-1).
130 |
131 | ## MoonKit 🌙
132 | Take a look at SunKit's spiritual brother, [MoonKit](https://github.com/davideilmito/MoonKit).
133 |
134 | ## Special thanks
135 | * [Davide Biancardi](https://github.com/davideilmito): Creator of SunKit.
136 |
--------------------------------------------------------------------------------
/Tests/SunKitTests/UT_EquatorialCoordinates.swift:
--------------------------------------------------------------------------------
1 | //
2 | // UT_EquatorialCoordinates.swift
3 | //
4 | //
5 | // Copyright 2023 Leonardo Bertinelli, Davide Biancardi, Raffaele Fulgente, Clelia Iovine, Nicolas Mariniello, Fabio Pizzano
6 | //
7 | // Licensed under the Apache License, Version 2.0 (the "License");
8 | // you may not use this file except in compliance with the License.
9 | // You may obtain a copy of the License at
10 | //
11 | // http://www.apache.org/licenses/LICENSE-2.0
12 | //
13 | // Unless required by applicable law or agreed to in writing, software
14 | // distributed under the License is distributed on an "AS IS" BASIS,
15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 | // See the License for the specific language governing permissions and
17 | // limitations under the License.
18 |
19 | import XCTest
20 | @testable import SunKit
21 |
22 | final class UT_EquatorialCoordinates: XCTestCase {
23 |
24 |
25 | /// Test of EquatorialCoordinates init
26 | func testOfInitEquatorialCoordinates() throws {
27 |
28 | //Test1: Consider a star whose right ascension is 3h24m06s and declination = −0°30'30''. Suppose the LST for an observer is 18h.Calculate the corresponding hour angle.
29 |
30 | //Step1:
31 | let declinationUnderTest: Angle = .init(degrees: DMS.init(degrees:0 , minutes: 30, seconds: 30,isANegativeZero: true).dMS2Decimal())
32 | let rightAscensionUnderTest: Angle = .init(degrees: HMS.init(hours: 3, minutes: 24, seconds: 06).hMS2Decimal())
33 | var equatorialCoordinatesUnderTest: EquatorialCoordinates = .init(declination: declinationUnderTest, rightAscension: rightAscensionUnderTest)
34 | //Step2: Converting hour Angle from angle to decimal
35 | let hourAngleDecimal = equatorialCoordinatesUnderTest.setHourAngleFrom(lstDecimal: 18)!.degrees / 15
36 |
37 | //Step3:
38 | XCTAssertTrue(abs(hourAngleDecimal - 14.598333) < 0.1)
39 |
40 | }
41 |
42 |
43 | /// Test of equatorial2Horizon
44 | func testOfequatorial2Horizon() throws {
45 |
46 |
47 | //Test1: Convert equatorial coordinates with declination = 17.248880 and right ascension = 4.257714. Expected horizon coordinates are altitude = 68°52 and Azimuth = 192°11′. For an observer at 38° N and LST is 4.562547h
48 |
49 | //Step1:
50 | var equatorialCoordinatesUnderTest: EquatorialCoordinates = .init(declination: .init(degrees: 17.248880), rightAscension: .init(degrees: 4.257714))
51 | var latitudeUnderTest: Angle = .init(degrees: 38)
52 | let lstUnderTest = 4.562547
53 |
54 | //Step2: Saving expected values in output for both azimuth and altitude
55 | var expectedAltitude = DMS.init(degrees: 68, minutes: 52, seconds: 0).dMS2Decimal()
56 | var expectedAzimuth = DMS.init(degrees: 192, minutes: 11, seconds: 0).dMS2Decimal()
57 |
58 | var azimuth = equatorialCoordinatesUnderTest.equatorial2Horizon(lstDecimal: lstUnderTest, latitude: latitudeUnderTest)!.azimuth.degrees
59 | var altitude = equatorialCoordinatesUnderTest.equatorial2Horizon(lstDecimal: lstUnderTest, latitude: latitudeUnderTest)!.altitude.degrees
60 |
61 | //Step3: Check if output of the function under test is close to expected output for both azimuth and altitude
62 | XCTAssertTrue(abs(azimuth - expectedAzimuth) < 0.1)
63 | XCTAssertTrue(abs(altitude - expectedAltitude) < 0.1)
64 |
65 |
66 | //Test2: Suppose a star is located at δ = −0°30′30′′, H = 16h29m45s. For an observer at 25° N latitude. Expected output shall be Azimuth = 80°31′31′′ ,and −20°34′40′′.
67 |
68 | //Step4:
69 | let hourAngleDecimal = HMS.init(hours: 16, minutes: 29, seconds: 45).hMS2Decimal()
70 | let hourAngle: Angle = .init(degrees: hourAngleDecimal * 15)
71 | latitudeUnderTest = .degrees(25)
72 | let declinationUnderTest: Angle = .init(degrees: DMS.init(degrees: 0, minutes: 30, seconds: 30,isANegativeZero: true).dMS2Decimal())
73 |
74 | //Step5: Creating a new instance of EquatorialCoordinates initialized with declinaiton and hour angle under test
75 | equatorialCoordinatesUnderTest = .init(declination: declinationUnderTest, hourAngle: hourAngle)
76 |
77 | //Step6: Saving expected values in output for both azimuth and altitude
78 | expectedAltitude = DMS.init(degrees: -20, minutes: 34, seconds: 40).dMS2Decimal()
79 | expectedAzimuth = DMS.init(degrees: 80, minutes: 31, seconds: 31).dMS2Decimal()
80 |
81 | azimuth = equatorialCoordinatesUnderTest.equatorial2Horizon(latitude: latitudeUnderTest)!.azimuth.degrees
82 | altitude = equatorialCoordinatesUnderTest.equatorial2Horizon(latitude: latitudeUnderTest)!.altitude.degrees
83 |
84 | //Step7: Check if output of the function under test is close to expected output for both azimuth and altitude
85 | XCTAssertTrue(abs(azimuth - expectedAzimuth) < 0.1)
86 | XCTAssertTrue(abs(altitude - expectedAltitude) < 0.1)
87 | }
88 |
89 | /// Test of equatorial2Ecliptic
90 | func testOfequatorial2Ecliptic() throws {
91 |
92 | //Test1: Given Jupiter’s equatorial coordinates of right ascension 12h18m47.5s, declination −0°43′35.5'', and the standard epoch J2000, compute Jupiter’s ecliptic coordinates.Expected output shall be eclipitc latitude = 1°12′00.0′′ and ecliptic longitude = 184°36′00.0′′
93 |
94 | //Step1:
95 | let rightAscensionUnderTest = HMS.init(hours: 12, minutes: 18, seconds: 47.5).hMS2Decimal()
96 | let declinationUnderTest = DMS.init(degrees: 0, minutes: 43, seconds: 35.5,isANegativeZero: true).dMS2Decimal()
97 | let equatorialCoordinatesUnderTest: EquatorialCoordinates = .init(declination: .degrees(declinationUnderTest), rightAscension: .degrees(rightAscensionUnderTest))
98 |
99 | let eclipticCoordinates = equatorialCoordinatesUnderTest.equatorial2Ecliptic() ?? .init(eclipticLatitude: .zero, eclipticLongitude: .zero)
100 |
101 | //Step2: Saving expected values in output for both latitude and longitude
102 | let expectedLatitude = DMS.init(degrees: 1, minutes: 12, seconds: 0).dMS2Decimal()
103 | let expectedLongitude = DMS.init(degrees: 184, minutes: 36, seconds: 0).dMS2Decimal()
104 |
105 | //Step3: Check if output of the function under test is close to expected output for both latitude and longitude
106 | XCTAssertTrue(abs(expectedLatitude - eclipticCoordinates.eclipticLatitude.degrees) < 0.1)
107 | XCTAssertTrue(abs(expectedLongitude - eclipticCoordinates.eclipticLongitude.degrees) < 0.1)
108 | }
109 | }
110 |
--------------------------------------------------------------------------------
/Sources/SunKit/EquatorialCoordinates.swift:
--------------------------------------------------------------------------------
1 | //
2 | // EquatorialCoordinates.swift
3 | //
4 | //
5 | // Copyright 2024 Leonardo Bertinelli, Davide Biancardi, Raffaele Fulgente, Clelia Iovine, Nicolas Mariniello, Fabio Pizzano
6 | //
7 | // Licensed under the Apache License, Version 2.0 (the "License");
8 | // you may not use this file except in compliance with the License.
9 | // You may obtain a copy of the License at
10 | //
11 | // http://www.apache.org/licenses/LICENSE-2.0
12 | //
13 | // Unless required by applicable law or agreed to in writing, software
14 | // distributed under the License is distributed on an "AS IS" BASIS,
15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 | // See the License for the specific language governing permissions and
17 | // limitations under the License.
18 |
19 | import Foundation
20 |
21 | public struct EquatorialCoordinates: Equatable, Hashable, Codable, Sendable {
22 |
23 | public private(set) var rightAscension: Angle? // rightAscension.degrees refers to h format
24 | public private(set) var declination: Angle //delta
25 |
26 | private(set) var hourAngle: Angle?
27 |
28 | init(declination: Angle,rightAscension: Angle, hourAngle: Angle){
29 | self.declination = declination
30 | self.rightAscension = rightAscension
31 | self.hourAngle = hourAngle
32 | }
33 |
34 | init(declination: Angle,rightAscension: Angle){
35 | self.declination = declination
36 | self.rightAscension = rightAscension
37 | self.hourAngle = nil
38 | }
39 |
40 | init(declination: Angle,hourAngle: Angle){
41 | self.declination = declination
42 | self.hourAngle = hourAngle
43 | self.rightAscension = nil
44 | }
45 |
46 | init(declination: Angle){
47 | self.declination = declination
48 | }
49 |
50 | /// To set right ascension we need LST and right ascension. If right ascension is nill we can't set it.
51 | /// - Parameter lstDecimal: Local Sideral Time in decimal
52 | /// - Returns: The value of hour angle just been set. Nil if right ascension is also nil
53 | public mutating func setHourAngleFrom(lstDecimal: Double) -> Angle?{
54 |
55 | guard let rightAscension = self.rightAscension else {return nil}
56 |
57 | var hourAngleDecimal = lstDecimal - rightAscension.degrees
58 | if hourAngleDecimal < 0 {
59 | hourAngleDecimal += 24
60 | }
61 | self.hourAngle = .init(degrees: hourAngleDecimal * 15)
62 |
63 | return self.hourAngle
64 | }
65 |
66 | /// To set right ascension we need LST and hour angle. If hour angle is nill we can't set it.
67 | /// - Parameter lstDecimal: Local Sideral Time in decimal
68 | /// - Returns: The value of right ascension just been set. Nil if hour angle is also nil
69 | public mutating func setRightAscensionFrom(lstDecimal: Double) -> Angle?{
70 |
71 | guard let hourAngle = self.hourAngle else {return nil}
72 |
73 | let hourAngleDecimal = hourAngle.degrees / 15
74 |
75 | self.rightAscension = .init(degrees: lstDecimal - hourAngleDecimal)
76 |
77 | return self.rightAscension
78 | }
79 |
80 |
81 | /// Converts Equatorial coordinates to Horizon coordinates.
82 | ///
83 | /// Since horizon coordinates depend on the position, we need also latitude parameter to create an EquatorialCoordinates instance.
84 | ///
85 | /// - Parameters:
86 | /// - lstDecimal: Local Sidereal Time in decimal format.
87 | /// - latitude: Latitude of the observer
88 | /// - Returns: Horizon coordinates for the given latitude and LST. Nil if hour angle cannot be computed due to the miss right ascnsion information
89 | public mutating func equatorial2Horizon(lstDecimal: Double,latitude: Angle) -> HorizonCoordinates?{
90 |
91 | guard let _ = setHourAngleFrom(lstDecimal: lstDecimal) else {return nil}
92 |
93 | //Step4:
94 | let tZeroEquatorialToHorizon = sin(declination.radians) * sin(latitude.radians) + cos(declination.radians) * cos(latitude.radians) * cos(hourAngle!.radians)
95 |
96 | //Step5:
97 | let altitude: Angle = .init(radians: asin(tZeroEquatorialToHorizon))
98 |
99 | //Step6:
100 | let tOneEquatorialToHorizon = sin(declination.radians) - sin(latitude.radians) * sin(altitude.radians)
101 |
102 | //Step7:
103 | let tTwoEquatorialToHorizon = tOneEquatorialToHorizon / (cos(latitude.radians) * cos(altitude.radians))
104 |
105 | //Step8:
106 | var azimuth: Angle = .init(radians: acos(tTwoEquatorialToHorizon))
107 | if sin(hourAngle!.radians) >= 0{
108 | azimuth.degrees = 360 - azimuth.degrees
109 | }
110 |
111 | return .init(altitude: altitude, azimuth: azimuth)
112 | }
113 |
114 | /// Converts Equatorial coordinates to Horizon coordinates.
115 | ///
116 | /// Since horizon coordinates depend on the position, we need also latitude parameter to create an EquatorialCoordinates instance.
117 | ///
118 | /// - Parameters:
119 | /// - latitude: Latitude of the observer
120 | /// - Returns: Horizon coordinates for the given latitude. Nil if hour angle is not defined.
121 | public func equatorial2Horizon(latitude: Angle) -> HorizonCoordinates?{
122 |
123 | guard let _ = self.hourAngle else {return nil}
124 |
125 | //Step4:
126 | let tZeroEquatorialToHorizon = sin(declination.radians) * sin(latitude.radians) + cos(declination.radians) * cos(latitude.radians) * cos(hourAngle!.radians)
127 |
128 | //Step5:
129 | let altitude: Angle = .init(radians: asin(tZeroEquatorialToHorizon))
130 |
131 | //Step6:
132 | let tOneEquatorialToHorizon = sin(declination.radians) - sin(latitude.radians) * sin(altitude.radians)
133 |
134 | //Step7:
135 | let tTwoEquatorialToHorizon = tOneEquatorialToHorizon / (cos(latitude.radians) * cos(altitude.radians))
136 |
137 | //Step8:
138 | var azimuth: Angle = .init(radians: acos(tTwoEquatorialToHorizon))
139 | if sin(hourAngle!.radians) >= 0{
140 | azimuth.degrees = 360 - azimuth.degrees
141 | }
142 |
143 | return .init(altitude: altitude, azimuth: azimuth)
144 | }
145 |
146 | public func equatorial2Ecliptic() -> EclipticCoordinates?{
147 |
148 | guard var rightAscension = rightAscension else {return nil}
149 |
150 | rightAscension.degrees = rightAscension.degrees * 15 //from h format to degrees
151 |
152 | //Step5:
153 | let tEquatorialToEcliptic: Angle = .init(radians: sin(declination.radians) * cos(EclipticCoordinates.obliquityOfTheEcliptic.radians) - cos(declination.radians) * sin(EclipticCoordinates.obliquityOfTheEcliptic.radians) * sin(rightAscension.radians))
154 |
155 | //Step6:
156 | let eclipticLatitude: Angle = .init(radians: asin(tEquatorialToEcliptic.radians))
157 |
158 | //Step7:
159 | let yEquatorialToEcliptic = sin(rightAscension.radians) * cos(EclipticCoordinates.obliquityOfTheEcliptic.radians) + tan(declination.radians) * sin(EclipticCoordinates.obliquityOfTheEcliptic.radians)
160 |
161 | //Step8:
162 | let xEquatorialToEcliptic = cos(rightAscension.radians)
163 |
164 | //Step9:
165 | var r: Angle = .init(radians: atan(yEquatorialToEcliptic / xEquatorialToEcliptic))
166 |
167 | //Step9:
168 | switch (yEquatorialToEcliptic >= 0,xEquatorialToEcliptic >= 0){
169 |
170 | case (true, true):
171 | break
172 | case (true,false):
173 | r.degrees += 180
174 | case(false,true):
175 | r.degrees += 360
176 | case(false,false):
177 | r.degrees += 180
178 | }
179 |
180 | let eclipticLongitude: Angle = .init(degrees: r.degrees)
181 |
182 | return .init(eclipticLatitude: eclipticLatitude, eclipticLongitude: eclipticLongitude)
183 | }
184 | }
185 |
--------------------------------------------------------------------------------
/Sources/SunKit/Utils.swift:
--------------------------------------------------------------------------------
1 | //
2 | // Utils.swift
3 | //
4 | //
5 | // Copyright 2024 Leonardo Bertinelli, Davide Biancardi, Raffaele Fulgente, Clelia Iovine, Nicolas Mariniello, Fabio Pizzano
6 | //
7 | // Licensed under the Apache License, Version 2.0 (the "License");
8 | // you may not use this file except in compliance with the License.
9 | // You may obtain a copy of the License at
10 | //
11 | // http://www.apache.org/licenses/LICENSE-2.0
12 | //
13 | // Unless required by applicable law or agreed to in writing, software
14 | // distributed under the License is distributed on an "AS IS" BASIS,
15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 | // See the License for the specific language governing permissions and
17 | // limitations under the License.
18 |
19 | import Foundation
20 |
21 | let SECONDS_IN_ONE_DAY = 86399
22 | let TWELVE_HOUR_IN_SECONDS: Double = 43200
23 | let TWO_HOURS_IN_SECONDS: Double = 7200
24 | let SECONDS_IN_TEN_MINUTES: Double = 600
25 | let SECONDS_IN_ONE_HOUR: Double = 3600
26 |
27 |
28 | /// - Parameters:
29 | /// - a: first operand
30 | /// - n: second operand
31 | /// - Returns: a % n if a is positive. If a isn't positive, it will add to the result of the modulo operation the value of the n operand until the result is positive.Please note that this function only works when both operands are integers.
32 | public func mod(_ a: Int, _ n: Int) -> Int {
33 | let r = a % n
34 | return r >= 0 ? r : r + n
35 | }
36 |
37 |
38 | /// Same as mod function described above, but this function can accept as first operand a Double and it handle the edge case where a is included between -1 and 0.
39 | /// - Parameters:
40 | /// - a: first operand
41 | /// - n: second operand
42 | /// - Returns: a % n if a is positive. If a isn't positive, it will add to the result of the modulo operation the value of the n operand until the result is positive.
43 | public func extendedMod(_ a: Double, _ n: Int) -> Double {
44 |
45 | let remainder: Double = a.truncatingRemainder(dividingBy: 1)
46 |
47 | if (a < 0 && a > -1){
48 |
49 | return Double(n) + remainder
50 | }
51 |
52 | let x = Double(mod(Int(a),n))
53 |
54 | return x + remainder
55 | }
56 |
57 |
58 |
59 | public func clamp(lower: Double, upper: Double, number: Double) -> Double {
60 |
61 | return min(upper,max(lower,number))
62 | }
63 |
64 |
65 | /// Creates a date with the UTC timezone
66 | /// - Parameters:
67 | /// - day: day of the date you want to create
68 | /// - month: month of the date you want to create
69 | /// - year: year of the date you want to create
70 | /// - hour: hour of the date you want to create
71 | /// - minute: minute of the date you want to create
72 | /// - seconds: second of the date you want to create
73 | /// - nanosecond: nanosecond of the date you want to create
74 | /// - Returns: A date with the parameters given in input. Used in combination with function jdFromDate, that accepts dates in UTC format
75 | public func createDateUTC(day: Int,month: Int,year: Int,hour: Int,minute: Int,seconds: Int, nanosecond: Int = 0) -> Date{
76 |
77 | var calendarUTC:Calendar = .init(identifier: .gregorian)
78 | calendarUTC.timeZone = .init(secondsFromGMT: 0)!
79 | var dateComponents = DateComponents()
80 | dateComponents.year = year
81 | dateComponents.month = month
82 | dateComponents.day = day
83 | dateComponents.hour = hour
84 | dateComponents.minute = minute
85 | dateComponents.second = seconds
86 | dateComponents.nanosecond = nanosecond
87 |
88 | return calendarUTC.date(from: dateComponents) ?? Date()
89 | }
90 |
91 |
92 | /// Creates a date with the timezone used in your current device
93 | /// - Parameters:
94 | /// - day: day of the date you want to create
95 | /// - month: month of the date you want to create
96 | /// - year: year of the date you want to create
97 | /// - hour: hour of the date you want to create
98 | /// - minute: minute of the date you want to create
99 | /// - seconds: second of the date you want to create
100 | /// - nanosecond: nanosecond of the date you want to create
101 | /// - Returns: A date with the parameters given in input
102 | public func createDateCurrentTimeZone(day: Int,month: Int,year: Int,hour: Int,minute: Int,seconds: Int, nanosecond: Int = 0) -> Date{
103 |
104 | var calendar: Calendar = .init(identifier: .gregorian)
105 | calendar.timeZone = .current
106 | var dateComponents = DateComponents()
107 | dateComponents.year = year
108 | dateComponents.month = month
109 | dateComponents.day = day
110 | dateComponents.hour = hour
111 | dateComponents.minute = minute
112 | dateComponents.second = seconds
113 | dateComponents.nanosecond = nanosecond
114 |
115 | return calendar.date(from: dateComponents) ?? Date()
116 | }
117 |
118 | /// Creates a date with a custom timezone
119 | /// - Parameters:
120 | /// - day: day of the date you want to create
121 | /// - month: month of the date you want to create
122 | /// - year: year of the date you want to create
123 | /// - hour: hour of the date you want to create
124 | /// - minute: minute of the date you want to create
125 | /// - seconds: second of the date you want to create
126 | /// - nanosecond: nanosecond of the date you want to create
127 | /// - timeZone: timezone of the date
128 | /// - Returns: A date with the parameters given in input
129 | public func createDateCustomTimeZone(day: Int,month: Int,year: Int,hour: Int,minute: Int,seconds: Int, nanosecond: Int = 0, timeZone: TimeZone) -> Date{
130 |
131 | var calendar: Calendar = .init(identifier: .gregorian)
132 | calendar.timeZone = timeZone
133 | var dateComponents = DateComponents()
134 | dateComponents.year = year
135 | dateComponents.month = month
136 | dateComponents.day = day
137 | dateComponents.hour = hour
138 | dateComponents.minute = minute
139 | dateComponents.second = seconds
140 | dateComponents.nanosecond = nanosecond
141 |
142 | return calendar.date(from: dateComponents) ?? Date()
143 | }
144 |
145 |
146 | /// Converts Julian Number in a date
147 | /// - Parameter jd: Julian number to convert in an UTC date
148 | /// - Returns: The date corresponding to the julian number in input
149 | public func dateFromJd(jd : Double) -> Date {
150 | let JD_JAN_1_1970_0000GMT = 2440587.5
151 | return Date(timeIntervalSince1970: (jd - JD_JAN_1_1970_0000GMT) * 86400)
152 | }
153 |
154 |
155 | /// Converts date in his Julian Number
156 | /// - Parameter date: UTC date to convert in julian number. TimeZone of the given date shall be equals to +0000.
157 | /// - Returns: The julian day number corresponding to date in input
158 | public func jdFromDate(date : Date) -> Double {
159 | let JD_JAN_1_1970_0000GMT = 2440587.5
160 | return JD_JAN_1_1970_0000GMT + date.timeIntervalSince1970
161 | / 86400
162 | }
163 |
164 |
165 | /// Converts UT time to Greenwich Sidereal Time
166 | /// - Parameter ut: UT time to convert in GST
167 | /// - Parameter timeZoneInSeconds: time zone expressed in seconds of your local civil time
168 | /// - Returns: GST equivalent of the UT given in input
169 | public func uT2GST(_ ut:Date) -> HMS{
170 |
171 | var calendarUTC: Calendar = .init(identifier: .gregorian)
172 | calendarUTC.timeZone = TimeZone(identifier: "GMT")!
173 |
174 | //Step1:
175 | let jd = jdFromDate(date: calendarUTC.startOfDay(for: ut))
176 |
177 | //Step2:
178 | let year = calendarUTC.component(.year, from: ut)
179 | let firstDayOfTheYear = calendarUTC.date(from: DateComponents(year: year , month: 1, day: 1)) ?? Date()
180 | let jdZero = jdFromDate(date: firstDayOfTheYear)
181 |
182 | //Step3:
183 | let days = jd - jdZero
184 |
185 | //Step4:
186 | let T = (jdZero - 2415020.0) / 36525.0
187 |
188 | //Step5:
189 | let R = 6.6460656 + 2400.051262 * T + 0.00002581*(T*T)
190 |
191 | //Step6:
192 | let B :Double = 24 - R + Double(24 * (year - 1900))
193 |
194 | //Step7:
195 | let TZero = 0.0657098 * days - B
196 |
197 | //Step8:
198 | let utDecimal = HMS.init(from: ut).hMS2Decimal()
199 |
200 | //Step9:
201 | var gstDecimal = TZero + 1.002738 * utDecimal
202 |
203 | if gstDecimal < 0 {
204 |
205 | gstDecimal += 24
206 |
207 | }else if gstDecimal >= 24 {
208 |
209 | gstDecimal -= 24
210 | }
211 |
212 | let gstHMS = HMS.init(decimal: gstDecimal)
213 |
214 | return gstHMS
215 | }
216 |
217 | /// Converts GST to Local Sidereal Time
218 | /// - Parameters:
219 | /// - gst: GST time to convert in LST
220 | /// - longitude: longitude of the observer
221 | /// - Parameter timeZoneInSeconds: time zone expressed in seconds of your local civil time
222 | /// - Returns: LST equivalent for the GST given in input
223 | public func gST2LST(_ gst: HMS, longitude: Angle) -> HMS{
224 |
225 | //Step1:
226 | let gstDecimal = gst.hMS2Decimal()
227 |
228 | //Step2:
229 | let adjustment: Double = longitude.degrees / 15.0
230 |
231 | //Step3:
232 | var lstDecimal = gstDecimal + adjustment
233 |
234 | if lstDecimal < 0 {
235 |
236 | lstDecimal += 24
237 | }else if lstDecimal >= 24 {
238 |
239 | lstDecimal -= 24
240 | }
241 |
242 | let lstHMS = HMS.init(decimal: lstDecimal)
243 |
244 | return lstHMS
245 | }
246 |
247 |
248 | /// Converts the number of seconds in HH:MM:ss
249 | /// - Parameter seconds: Number of seconds that have to be converted
250 | /// - Returns: From value in input the equivalent in (hours,minute,seconds)
251 | public func secondsToHoursMinutesSeconds(_ seconds : Int) -> (Int,Int,Int) {
252 |
253 | return (seconds / 3600, (seconds % 3600) / 60, (seconds % 3600) % 60)
254 | }
255 |
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