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

earth/apsis.go

@@ -26,7 +26,7 @@ func Aphelion(year int) ApsisInfo {
 
 func convertEarthApsisInfo(event basic.ApsisEvent) ApsisInfo {
 	return ApsisInfo{
-		Time:     basic.JDE2DateByZone(event.JDE, time.UTC, false),
+		Time:     basic.JD2DateByZone(event.JD, time.UTC, false),
 		Distance: event.Distance,
 	}
 }

earth/apsis_test.go

@@ -11,8 +11,8 @@ import (
 func TestApsisWrappersMatchBasic(t *testing.T) {
 	peri := basic.EarthPerihelion(2026)
 	periWrapped := Perihelion(2026)
-	if !periWrapped.Time.Equal(basic.JDE2DateByZone(peri.JDE, time.UTC, false)) {
-		t.Fatalf("perihelion time mismatch: got %s want %s", periWrapped.Time.Format(time.RFC3339Nano), basic.JDE2DateByZone(peri.JDE, time.UTC, false).Format(time.RFC3339Nano))
+	if !periWrapped.Time.Equal(basic.JD2DateByZone(peri.JD, time.UTC, false)) {
+		t.Fatalf("perihelion time mismatch: got %s want %s", periWrapped.Time.Format(time.RFC3339Nano), basic.JD2DateByZone(peri.JD, time.UTC, false).Format(time.RFC3339Nano))
 	}
 	if math.Float64bits(periWrapped.Distance) != math.Float64bits(peri.Distance) {
 		t.Fatalf("perihelion distance mismatch: got %.12f want %.12f", periWrapped.Distance, peri.Distance)
@@ -20,8 +20,8 @@ func TestApsisWrappersMatchBasic(t *testing.T) {
 
 	aphe := basic.EarthAphelion(2026)
 	apheWrapped := Aphelion(2026)
-	if !apheWrapped.Time.Equal(basic.JDE2DateByZone(aphe.JDE, time.UTC, false)) {
-		t.Fatalf("aphelion time mismatch: got %s want %s", apheWrapped.Time.Format(time.RFC3339Nano), basic.JDE2DateByZone(aphe.JDE, time.UTC, false).Format(time.RFC3339Nano))
+	if !apheWrapped.Time.Equal(basic.JD2DateByZone(aphe.JD, time.UTC, false)) {
+		t.Fatalf("aphelion time mismatch: got %s want %s", apheWrapped.Time.Format(time.RFC3339Nano), basic.JD2DateByZone(aphe.JD, time.UTC, false).Format(time.RFC3339Nano))
 	}
 	if math.Float64bits(apheWrapped.Distance) != math.Float64bits(aphe.Distance) {
 		t.Fatalf("aphelion distance mismatch: got %.12f want %.12f", apheWrapped.Distance, aphe.Distance)

earth/earth.go

@@ -11,6 +11,6 @@ import (
 // 返回 date 对应绝对时刻的地球轨道偏心率，无量纲。
 // Returns Earth's orbital eccentricity at the instant represented by date; the value is dimensionless.
 func EarthEccentricity(date time.Time) float64 {
-	jde := basic.Date2JDE(date.UTC())
-	return basic.Earthe(basic.TD2UT(jde, true))
+	jd := basic.Date2JD(date.UTC())
+	return basic.Earthe(basic.UTC2TT(jd))
 }