feat: 完善时标与天象几何计算并扩展输出接口

- 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

basic/orbit_phase.go

@@ -3,37 +3,37 @@ package basic
 import . "b612.me/astro/tools"
 
 // OrbitSunDistance 返回轨道目标在给定 TT/TDB 儒略日的日心距离，单位 AU。
-func OrbitSunDistance(jd float64, elements OrbitElements) float64 {
-	_, _, distance := OrbitHeliocentricEclipticJ2000(jd, elements)
+func OrbitSunDistance(jde float64, elements OrbitElements) float64 {
+	_, _, distance := OrbitHeliocentricEclipticJ2000(jde, elements)
 	return distance
 }
 
 // OrbitEarthDistance 返回轨道目标在给定 TT/TDB 儒略日的地心距离，单位 AU。
-func OrbitEarthDistance(jd float64, elements OrbitElements) float64 {
-	_, _, distance := OrbitGeocentricEclipticJ2000(jd, elements)
+func OrbitEarthDistance(jde float64, elements OrbitElements) float64 {
+	_, _, distance := OrbitGeocentricEclipticJ2000(jde, elements)
 	return distance
 }
 
 // OrbitPhaseAngle 返回轨道目标的相位角，单位度。
-func OrbitPhaseAngle(jd float64, elements OrbitElements) float64 {
-	return ArcCos(orbitPhaseCosine(jd, elements))
+func OrbitPhaseAngle(jde float64, elements OrbitElements) float64 {
+	return ArcCos(orbitPhaseCosine(jde, elements))
 }
 
 // OrbitIlluminatedFraction 返回轨道目标的被照亮比例。
-func OrbitIlluminatedFraction(jd float64, elements OrbitElements) float64 {
-	return (1 + orbitPhaseCosine(jd, elements)) / 2
+func OrbitIlluminatedFraction(jde float64, elements OrbitElements) float64 {
+	return (1 + orbitPhaseCosine(jde, elements)) / 2
 }
 
 // OrbitElongation 返回轨道目标相对于太阳的地心视角距，单位度。
-func OrbitElongation(jd float64, elements OrbitElements) float64 {
-	lon, lat, _ := OrbitApparentGeocentricEcliptic(jd, elements)
-	return StarAngularSeparation(lon, lat, HSunApparentLo(jd), HSunTrueBo(jd))
+func OrbitElongation(jde float64, elements OrbitElements) float64 {
+	lon, lat, _ := OrbitApparentGeocentricEcliptic(jde, elements)
+	return StarAngularSeparation(lon, lat, HSunApparentLo(jde), HSunTrueBo(jde))
 }
 
-func orbitPhaseCosine(jd float64, elements OrbitElements) float64 {
-	sunDistance := OrbitSunDistance(jd, elements)
-	earthDistance := OrbitEarthDistance(jd, elements)
-	earthSunDistance := EarthAway(jd)
+func orbitPhaseCosine(jde float64, elements OrbitElements) float64 {
+	sunDistance := OrbitSunDistance(jde, elements)
+	earthDistance := OrbitEarthDistance(jde, elements)
+	earthSunDistance := EarthAway(jde)
 	cosine := (sunDistance*sunDistance + earthDistance*earthDistance - earthSunDistance*earthSunDistance) / (2 * sunDistance * earthDistance)
 	return clampUnit(cosine)
 }