b612
16c62a97d5
- 新增时标、ΔT 模型、质心时间与 UT1 支持 - 改进日月食、月掩、行星事件及路径边界计算 - 完善恒星三维自行与动态距离传播 - 扩展 SVG、GeoJSON、KML 输出与底层距离换算工具 - 整理中英文手册、示例资源及回归测试
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
package saturn
|
|
|
|
import (
|
|
"time"
|
|
|
|
"b612.me/astro/basic"
|
|
"b612.me/astro/calendar"
|
|
)
|
|
|
|
// PhaseAngle 相位角，单位度 / phase angle in degrees.
|
|
func PhaseAngle(date time.Time) float64 {
|
|
return PhaseAngleN(date, -1)
|
|
}
|
|
|
|
// PhaseAngleN 相位角（截断版），单位度 / truncated phase angle in degrees.
|
|
func PhaseAngleN(date time.Time, n int) float64 {
|
|
return basic.SaturnPhaseAngleN(phaseJD(date), n)
|
|
}
|
|
|
|
// IlluminatedFraction 被照亮比例 / illuminated fraction.
|
|
func IlluminatedFraction(date time.Time) float64 {
|
|
return IlluminatedFractionN(date, -1)
|
|
}
|
|
|
|
// IlluminatedFractionN 被照亮比例（截断版） / truncated illuminated fraction.
|
|
func IlluminatedFractionN(date time.Time, n int) float64 {
|
|
return basic.SaturnIlluminatedFractionN(phaseJD(date), n)
|
|
}
|
|
|
|
// Phase 相位，被照亮比例 / phase, illuminated fraction.
|
|
func Phase(date time.Time) float64 {
|
|
return IlluminatedFraction(date)
|
|
}
|
|
|
|
// PhaseN 相位（截断版），被照亮比例 / truncated phase, illuminated fraction.
|
|
func PhaseN(date time.Time, n int) float64 {
|
|
return IlluminatedFractionN(date, n)
|
|
}
|
|
|
|
// BrightLimbPositionAngle 亮面中心位置角，单位度 / bright limb position angle in degrees.
|
|
func BrightLimbPositionAngle(date time.Time) float64 {
|
|
return BrightLimbPositionAngleN(date, -1)
|
|
}
|
|
|
|
// BrightLimbPositionAngleN 亮面中心位置角（截断版），单位度 / truncated bright limb position angle in degrees.
|
|
func BrightLimbPositionAngleN(date time.Time, n int) float64 {
|
|
return basic.SaturnBrightLimbPositionAngleN(phaseJD(date), n)
|
|
}
|
|
|
|
func phaseJD(date time.Time) float64 {
|
|
return basic.UTC2TT(calendar.Date2JD(date.UTC()))
|
|
}
|