EclipticCoordinates

public struct EclipticCoordinates : CustomStringConvertible

The coordinates in the ecliptic (a.k.a. celestial) system, based on solar-system planets orbital planes.

  • The celestial longitude

    Declaration

    Swift

    public let celestialLongitude: Degree
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  • The celestial latitude

    Declaration

    Swift

    public let celestialLatitude: Degree
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  • The epoch of the coordinates.

    Declaration

    Swift

    public let epoch: Epoch
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  • The reference equinox.

    Declaration

    Swift

    public let equinox: Equinox
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  • A convenience accessor for the celestial longitude

    Declaration

    Swift

    public var lambda: Degree { get }
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  • A convenience accessor for the celestial latitude

    Declaration

    Swift

    public var beta: Degree { get }
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  • Creates a new EclipticCoordinates instance.

    Declaration

    Swift

    public init(celestialLongitude: Degree, celestialLatitude: Degree, epoch: Epoch = .J2000, equinox: Equinox = .standardJ2000)

    Parameters

    celestialLongitude

    The celestial longitude value
    celestialLatitude

    The celestial latitude value
    epoch

    The optional epoch value, default to J2000.0
    equinox

    The optional equinox, default to standard equinox J2000.0.
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  • Creates a new EclipticCoordinates instance.

    Declaration

    Swift

    public init(lambda: Degree, beta: Degree, epoch: Epoch = .J2000, equinox: Equinox = .standardJ2000)

    Parameters

    lambda

    The longitude value.
    beta

    The latitude value
    epoch

    The optional epoch value, default to J2000.0. It is not called ‘epsilon’ to avoid confusion with equinox.
    equinox

    The optional equinox, default to standard equinox J2000.0.
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  • Returns equatorial coordinates corresponding to the current ecliptic ones.

    Declaration

    Swift

    public func makeEquatorialCoordinates() -> EquatorialCoordinates

    Return Value

    A new equatorial coordinates instance.

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  • Returns apparent equatorial coordinates corresponding to the current ecliptic ones.

    Declaration

    Swift

    public func makeApparentEquatorialCoordinates() -> EquatorialCoordinates

    Return Value

    A new equatorial coordinates instance

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  • Returns EclipticCoordinates precessed to a new given epoch.

    Declaration

    Swift

    public func precessedCoordinates(to newEpoch: Epoch) -> EclipticCoordinates

    Parameters

    newEpoch

    The new epoch to precess to.

    Return Value

    A new EclipticCoordinates instance

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  • Return new ecliptic coordinates corrected for the annual aberration of the Earth. It must be used for star coordinates, not planets. See AA, p149.

    Declaration

    Swift

    public func correctedForAnnualAberration(julianDay: JulianDay, highPrecision: Bool = true) -> EclipticCoordinates

    Parameters

    julianDay

    The julian day for which the aberration is computed.
    highPrecision

    If false, the Ron-Vondrák algorithm is used. See AA p.153. If true, the newer VSOP87 theory is used.OSun

    Return Value

    Corected ecliptic coordinates of the star.

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  • Description of EclipticCoordinates

    Declaration

    Swift

    public var description: String { get }
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