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63 lines
2.4 KiB
Go
63 lines
2.4 KiB
Go
package jupiter
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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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// GalileanSatellitePhenomenon 木星伽利略卫星瞬时现象 / instantaneous Galilean-satellite phenomena.
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//
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// Transit 为凌日，Occultation 为掩蔽，Eclipse 为进入木星本影，ShadowTransit 为卫星影子落在可见木星盘面上。
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// ShadowOffset* 仅在 ShadowTransit 为 true 时有意义。
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// Transit means a transit across Jupiter's disk, Occultation means hidden behind Jupiter, Eclipse means inside Jupiter's umbra, and ShadowTransit means the shadow falls on the visible Jovian disk.
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// ShadowOffset* are meaningful only when ShadowTransit is true.
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type GalileanSatellitePhenomenon struct {
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Transit bool
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Occultation bool
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Eclipse bool
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ShadowTransit bool
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ShadowOffsetXArcsec float64
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ShadowOffsetYArcsec float64
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ShadowOffsetXJupiterR float64
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ShadowOffsetYJupiterR float64
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}
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// GalileanPhenomenaInfo 四颗伽利略卫星瞬时现象 / instantaneous phenomena of the four Galilean satellites.
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type GalileanPhenomenaInfo struct {
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Io GalileanSatellitePhenomenon
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Europa GalileanSatellitePhenomenon
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Ganymede GalileanSatellitePhenomenon
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Callisto GalileanSatellitePhenomenon
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}
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// SatellitePhenomena 木星四颗伽利略卫星瞬时现象 / instantaneous phenomena of Jupiter's four Galilean satellites.
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//
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// date 表示观测绝对时刻；内部使用该时刻对应的 TT/TDB 历元求值。
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// date is the observing instant; internally the corresponding TT/TDB epoch is used.
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func SatellitePhenomena(date time.Time) GalileanPhenomenaInfo {
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jde := basic.Date2JDE(date.UTC())
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phenomena := basic.JupiterGalileanSatellitePhenomena(jde)
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return GalileanPhenomenaInfo{
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Io: galileanPhenomenonFromBasic(phenomena[0]),
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Europa: galileanPhenomenonFromBasic(phenomena[1]),
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Ganymede: galileanPhenomenonFromBasic(phenomena[2]),
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Callisto: galileanPhenomenonFromBasic(phenomena[3]),
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}
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}
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func galileanPhenomenonFromBasic(phenomenon basic.JupiterGalileanPhenomenon) GalileanSatellitePhenomenon {
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return GalileanSatellitePhenomenon{
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Transit: phenomenon.Transit,
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Occultation: phenomenon.Occultation,
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Eclipse: phenomenon.Eclipse,
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ShadowTransit: phenomenon.ShadowTransit,
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ShadowOffsetXArcsec: phenomenon.ShadowOffsetXArcsec,
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ShadowOffsetYArcsec: phenomenon.ShadowOffsetYArcsec,
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ShadowOffsetXJupiterR: phenomenon.ShadowOffsetXJupiterRadii,
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ShadowOffsetYJupiterR: phenomenon.ShadowOffsetYJupiterRadii,
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}
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}
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