53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
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package venus
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import (
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"time"
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"b612.me/astro/basic"
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"b612.me/astro/calendar"
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)
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// PhaseAngle 相位角，单位度 / phase angle in degrees.
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func PhaseAngle(date time.Time) float64 {
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return PhaseAngleN(date, -1)
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}
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// PhaseAngleN 相位角（截断版），单位度 / truncated phase angle in degrees.
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func PhaseAngleN(date time.Time, n int) float64 {
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return basic.VenusPhaseAngleN(phaseJD(date), n)
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}
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// IlluminatedFraction 被照亮比例 / illuminated fraction.
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func IlluminatedFraction(date time.Time) float64 {
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return IlluminatedFractionN(date, -1)
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}
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// IlluminatedFractionN 被照亮比例（截断版） / truncated illuminated fraction.
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func IlluminatedFractionN(date time.Time, n int) float64 {
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return basic.VenusIlluminatedFractionN(phaseJD(date), n)
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}
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// Phase 相位，被照亮比例 / phase, illuminated fraction.
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func Phase(date time.Time) float64 {
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return IlluminatedFraction(date)
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}
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// PhaseN 相位（截断版），被照亮比例 / truncated phase, illuminated fraction.
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func PhaseN(date time.Time, n int) float64 {
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return IlluminatedFractionN(date, n)
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}
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// BrightLimbPositionAngle 亮面中心位置角，单位度 / bright limb position angle in degrees.
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func BrightLimbPositionAngle(date time.Time) float64 {
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return BrightLimbPositionAngleN(date, -1)
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}
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// BrightLimbPositionAngleN 亮面中心位置角（截断版），单位度 / truncated bright limb position angle in degrees.
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func BrightLimbPositionAngleN(date time.Time, n int) float64 {
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return basic.VenusBrightLimbPositionAngleN(phaseJD(date), n)
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}
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func phaseJD(date time.Time) float64 {
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return basic.TD2UT(calendar.Date2JDE(date.UTC()), true)
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}
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