35 lines
1.7 KiB
Go
35 lines
1.7 KiB
Go
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package moon
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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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// BrightLimbPositionAngle 月亮明亮边缘位置角，单位度 / position angle of the Moon's bright limb 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 月亮明亮边缘位置角（截断版），单位度 / truncated position angle of the Moon's bright limb in degrees.
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func BrightLimbPositionAngleN(date time.Time, n int) float64 {
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return basic.MoonBrightLimbPositionAngleN(observationTT(date), n)
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}
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// TopocentricBrightLimbPositionAngle 月亮站心明亮边缘位置角，单位度 / topocentric position angle of the Moon's bright limb in degrees.
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//
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// date 为观测时刻；observerLon/observerLat 为观测者经纬度，东正西负、北正南负；height 为海拔高度，单位米。
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// date is the observing instant; observerLon/observerLat are east-positive and north-positive; height is observer elevation in meters.
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func TopocentricBrightLimbPositionAngle(date time.Time, observerLon, observerLat, height float64) float64 {
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return TopocentricBrightLimbPositionAngleN(date, observerLon, observerLat, height, -1)
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}
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// TopocentricBrightLimbPositionAngleN 月亮站心明亮边缘位置角（截断版），单位度 / truncated topocentric position angle of the Moon's bright limb in degrees.
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func TopocentricBrightLimbPositionAngleN(date time.Time, observerLon, observerLat, height float64, n int) float64 {
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return basic.MoonTopocentricBrightLimbPositionAngleN(observationTT(date), observerLon, observerLat, height, n)
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}
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func observationTT(date time.Time) float64 {
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return basic.TD2UT(basic.Date2JDE(date.UTC()), true)
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}
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