From d479d39352c6fb44902b75ccef3a9230577c3d72 Mon Sep 17 00:00:00 2001
From: Starainrt <i@b612.me>
Date: Tue, 16 Jan 2024 11:30:53 +0800
Subject: [PATCH] update

---
 basic/sun.go        |  1 -
 basic/sun_test.go   | 67 +++++++++++++++++++++++++++++++++++++++++++++
 calendar/chinese.go |  7 ++---
 3 files changed, 69 insertions(+), 6 deletions(-)

diff --git a/basic/sun.go b/basic/sun.go
index 876bc03..abcdde4 100644
--- a/basic/sun.go
+++ b/basic/sun.go
@@ -101,7 +101,6 @@ func SunMidFun(JD float64) float64 { //'太阳中间方程
 	return SunMidFun
 }
 func SunTrueLo(JD float64) float64 { // '太阳真黄经
-
 	SunTrueLo := SunLo(JD) + SunMidFun(JD)
 	return SunTrueLo
 }
diff --git a/basic/sun_test.go b/basic/sun_test.go
index 90c62bb..8d2353a 100644
--- a/basic/sun_test.go
+++ b/basic/sun_test.go
@@ -153,3 +153,70 @@ func Test_SunAz(t *testing.T) {
 	fmt.Println(SunAngle(Date2JDE(time.Date(2022, 5, 30, 11, 55, 0, 0, cst)),
 		120, 30, 8.0))
 }
+
+func TestJQDate(t *testing.T) {
+	trimDay := func(d float64) float64 {
+		if d-math.Floor(d) < 0.5 {
+			return math.Floor(d) - 0.5
+		}
+		return math.Floor(d) + 0.5
+	}
+	c := 0
+	for year := 1900; year <= 2600; year++ {
+		for pos := 0; pos < 360; pos += 15 {
+			n := newGetJQTime(year, pos)
+			o := GetJQTime(year, pos)
+			if trimDay(n) != trimDay(o) {
+				c++
+				fmt.Printf("\"%d%03d\":%.0f,", year, pos, trimDay(o)-trimDay(n))
+			}
+		}
+	}
+	fmt.Println(c)
+}
+
+func newGetJQTime(Year, Angle int) float64 { //节气时间
+	var j int = 1
+	var Day int
+	var tp float64
+	if Angle%2 == 0 {
+		Day = 18
+	} else {
+		Day = 3
+	}
+	if Angle%10 != 0 {
+		tp = float64(Angle+15.0) / 30.0
+	} else {
+		tp = float64(Angle) / 30.0
+	}
+	Month := 3 + tp
+	if Month > 12 {
+		Month -= 12
+	}
+	JD1 := JDECalc(int(Year), int(Month), float64(Day))
+	if Angle == 0 {
+		Angle = 360
+	}
+	for i := 0; i < j; i++ {
+		for {
+			JD0 := JD1
+			stDegree := newJQLospec(JD0) - float64(Angle)
+			stDegreep := (newJQLospec(JD0+0.000005) - newJQLospec(JD0-0.000005)) / 0.00001
+			JD1 = JD0 - stDegree/stDegreep
+			if math.Abs(JD1-JD0) <= 0.00001 {
+				break
+			}
+		}
+		JD1 -= 0.001
+	}
+	JD1 += 0.001
+	return JD1 - 0.0046296296296296
+}
+
+func newJQLospec(JD float64) float64 {
+	t := tools.FloatRound(SunApparentLo(JD), 9)
+	if t <= 12 {
+		t += 360
+	}
+	return t
+}
diff --git a/calendar/chinese.go b/calendar/chinese.go
index d9f2356..d7fdb32 100644
--- a/calendar/chinese.go
+++ b/calendar/chinese.go
@@ -166,8 +166,7 @@ recalc:
 	strday := []string{"初", "十", "廿", "三"}
 	for i := 0; i < 13; i++ {
 		var dayofLunar = 29
-		tmp := uint8(magic&0x3FFE>>(13-i)) & 1
-		if tmp == 1 {
+		if uint8(magic&0x3FFE>>(13-i))&1 == 1 {
 			dayofLunar++
 		}
 		if totalDay+dayofLunar > diffDay {
@@ -222,10 +221,8 @@ func rapidSolar(year, month, day int, isLeap bool) time.Time {
 			target := spring.AddDate(0, 0, totalDay+day-1)
 			return target
 		}
-
 		var dayofLunar = 29
-		tmp := uint8(magic&0x3FFE>>(13-i)) & 1
-		if tmp == 1 {
+		if uint8(magic&0x3FFE>>(13-i))&1 == 1 {
 			dayofLunar++
 		}
 		totalDay += dayofLunar