- fix: Correct sun.TrueBo calculation, now using basic.HSunTrueBo for correct solar latitude

- fix: Rename GetSunDownTime to GetSunSetTime in basic/sun.go and update related calls/outputs
- fix: Update test cases to use new method and error constant names

- improve: Rename all DownTime/Down functions to SetTime/Set for consistency
- improve: Standardize ERR_XXX_NEVER_DOWN error constants to ERR_XXX_NEVER_SET, with ERR_XXX_NEVER_DOWN kept as compatibility alias
- improve: More standard naming for interfaces and errors to improve maintainability and readability

moon/moon.go

@@ -11,7 +11,7 @@ import (
 var (
 	ERR_MOON_NEVER_RISE = errors.New("ERROR:极夜，月亮在今日永远在地平线下！")
 	ERR_MOON_NEVER_SET  = errors.New("ERROR:极昼，月亮在今日永远在地平线上！")
-	// ERR_MOON_NEVER_DOWN deprecated -- use ERR_MOON_NEVER_SET instead
+	// ERR_MOON_NEVER_DOWN deprecated: -- use ERR_MOON_NEVER_SET instead
 	ERR_MOON_NEVER_DOWN = ERR_MOON_NEVER_SET
 	ERR_NOT_TODAY       = errors.New("ERROR:月亮已在（昨日/明日）（升起/降下）")
 )
@@ -171,7 +171,7 @@ func RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, e
 	return basic.JDE2DateByZone(riseJde, date.Location(), true), err
 }
 
-// deprecated -- use SetTime instead
+// deprecated: -- use SetTime instead
 // DownTime 落下时间
 // date，取日期，时区忽略
 // lon，经度，东正西负