- 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

star/star.go

@@ -11,7 +11,7 @@ import (
 var (
 	ERR_STAR_NEVER_RISE = errors.New("ERROR:极夜，星星在今日永远在地平线下！")
 	ERR_STAR_NEVER_SET  = errors.New("ERROR:极昼，星星在今日永远在地平线上！")
-	// ERR_STAR_NEVER_DOWN deprecated -- use ERR_STAR_NEVER_SET instead
+	// ERR_STAR_NEVER_DOWN deprecated: -- use ERR_STAR_NEVER_SET instead
 	ERR_STAR_NEVER_DOWN = ERR_STAR_NEVER_SET
 )
 
@@ -59,7 +59,7 @@ func RiseTime(date time.Time, ra, dec, lon, lat, height float64, aero bool) (tim
 	return basic.JDE2DateByZone(riseJde, date.Location(), true), err
 }
 
-// deprecated -- use SetTime instead
+// deprecated: -- use SetTime instead
 // DownTime 星星降落时间
 //
 //	date, 世界时（忽略此处时区）