50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
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package saturn
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import (
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"time"
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"b612.me/astro/basic"
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)
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// PhysicalInfo 土星物理观测参数 / physical observing parameters of Saturn.
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type PhysicalInfo struct {
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// SubEarthLongitude 子地经度，单位度；采用 Saturn 当前 IAU/Horizons 西经为正约定。
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SubEarthLongitude float64
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// SubEarthLatitude 子地纬度，单位度。
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SubEarthLatitude float64
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// SubSolarLongitude 子日经度，单位度；采用 Saturn 当前 IAU/Horizons 西经为正约定。
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SubSolarLongitude float64
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// SubSolarLatitude 子日纬度，单位度。
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SubSolarLatitude float64
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// NorthPolePositionAngle 土星北极位置角，单位度。
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NorthPolePositionAngle float64
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}
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// Physical 土星物理观测参数 / physical observing parameters of Saturn.
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func Physical(date time.Time) PhysicalInfo {
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return PhysicalN(date, -1)
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}
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// PhysicalN 土星物理观测参数（截断版） / truncated physical observing parameters of Saturn.
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func PhysicalN(date time.Time, n int) PhysicalInfo {
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jde := basic.Date2JDE(date.UTC())
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info := basic.SaturnPhysicalN(basic.TD2UT(jde, true), n)
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return PhysicalInfo{
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SubEarthLongitude: info.SubEarthLongitude,
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SubEarthLatitude: info.SubEarthLatitude,
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SubSolarLongitude: info.SubSolarLongitude,
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SubSolarLatitude: info.SubSolarLatitude,
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NorthPolePositionAngle: info.NorthPolePositionAngle,
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}
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}
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// PhysicalSystemIII 土星 System III 物理观测参数 / Saturn System III physical observing parameters.
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func PhysicalSystemIII(date time.Time) PhysicalInfo {
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return Physical(date)
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}
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// PhysicalSystemIIIN 土星 System III 物理观测参数（截断版） / truncated Saturn System III physical observing parameters.
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func PhysicalSystemIIIN(date time.Time, n int) PhysicalInfo {
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return PhysicalN(date, n)
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}
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