56 lines
2.2 KiB
Go
56 lines
2.2 KiB
Go
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package orbit
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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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// EarthDistance 地心距离 / Earth distance.
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//
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// 返回轨道目标在 date 对应绝对时刻到地球的几何距离，单位 AU。
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// Returns the geometric distance from the orbiting target to Earth at the instant represented by date, in astronomical units.
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func EarthDistance(date time.Time, elements Elements) float64 {
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return basic.OrbitEarthDistance(ttJulianDay(date), toBasicElements(elements))
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}
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// SunDistance 日心距离 / Sun distance.
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//
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// 返回轨道目标在 date 对应绝对时刻到太阳的几何距离，单位 AU。
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// Returns the geometric distance from the orbiting target to the Sun at the instant represented by date, in astronomical units.
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func SunDistance(date time.Time, elements Elements) float64 {
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return basic.OrbitSunDistance(ttJulianDay(date), toBasicElements(elements))
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}
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// Elongation 日距角 / elongation.
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//
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// 返回轨道目标与太阳在地心视方向上的角距，单位度。
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// Returns the apparent geocentric angular separation between the target and the Sun, in degrees.
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func Elongation(date time.Time, elements Elements) float64 {
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return basic.OrbitElongation(ttJulianDay(date), toBasicElements(elements))
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}
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// PhaseAngle 相位角 / phase angle.
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//
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// 返回轨道目标的相位角，单位度。
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// Returns the phase angle of the orbiting target, in degrees.
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func PhaseAngle(date time.Time, elements Elements) float64 {
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return basic.OrbitPhaseAngle(ttJulianDay(date), toBasicElements(elements))
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}
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// IlluminatedFraction 被照亮比例 / illuminated fraction.
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//
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// 返回轨道目标被太阳照亮的可见比例，范围通常为 [0, 1]。
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// Returns the illuminated fraction of the target, typically in the range [0, 1].
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func IlluminatedFraction(date time.Time, elements Elements) float64 {
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return basic.OrbitIlluminatedFraction(ttJulianDay(date), toBasicElements(elements))
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}
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// Phase 相位 / phase.
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//
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// 返回轨道目标被照亮比例，是 IlluminatedFraction 的别名。
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// Returns the illuminated fraction of the target and is an alias of IlluminatedFraction.
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func Phase(date time.Time, elements Elements) float64 {
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return IlluminatedFraction(date, elements)
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}
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