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package basic
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import (
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"fmt"
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"math"
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"strings"
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"time"
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)
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var defDeltaTFn = DefaultDeltaT
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/*
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@name: 儒略日计算
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@dec: 计算给定时间的儒略日,1582年改力后为格里高利历,之前为儒略历
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@ 请注意,传入的时间在天文计算中一般为力学时,应当注意和世界时的转化
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*/
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func JDECalc(Year, Month int, Day float64) float64 {
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if Month == 1 || Month == 2 {
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Year--
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Month += 12
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}
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var tmpvarB int
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tmpvar := fmt.Sprintf("%04d-%02d-%2d", Year, Month, int(math.Floor(Day)))
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if strings.Compare(tmpvar, `1582-10-04`) != 1 {
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tmpvarB = 0
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} else {
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tmpvarA := int(Year / 100)
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tmpvarB = 2 - tmpvarA + int(tmpvarA/4)
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}
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return (math.Floor(365.25*(float64(Year)+4716.0)) + math.Floor(30.6001*float64(Month+1)) + Day + float64(tmpvarB) - 1524.5)
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}
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/*
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@name: 获得当前儒略日时间:当地世界时,非格林尼治时间
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*/
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func GetNowJDE() (NowJDE float64) {
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Time := float64(time.Now().Second())/3600.0/24.0 + float64(time.Now().Minute())/60.0/24.0 + float64(time.Now().Hour())/24.0
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NowJDE = JDECalc(time.Now().Year(), int(time.Now().Month()), float64(time.Now().Day())+Time)
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return
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}
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func dt_ext(y, jsd float64) float64 { // 二次曲线外推,用于数值外插
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dy := (y - 1820) / 100.00
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return -20 + jsd*dy*dy
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}
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func dt_cal(y float64) float64 { //传入年, 返回世界时UT与原子时(力学时 TD)之差, ΔT = TD - UT
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dt_at := []float64{
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-4000, 108371.7, -13036.80, 392.000, 0.0000,
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-500, 17201.0, -627.82, 16.170, -0.3413,
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-150, 12200.6, -346.41, 5.403, -0.1593,
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150, 9113.8, -328.13, -1.647, 0.0377,
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500, 5707.5, -391.41, 0.915, 0.3145,
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900, 2203.4, -283.45, 13.034, -0.1778,
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1300, 490.1, -57.35, 2.085, -0.0072,
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1600, 120.0, -9.81, -1.532, 0.1403,
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1700, 10.2, -0.91, 0.510, -0.0370,
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1800, 13.4, -0.72, 0.202, -0.0193,
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1830, 7.8, -1.81, 0.416, -0.0247,
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1860, 8.3, -0.13, -0.406, 0.0292,
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1880, -5.4, 0.32, -0.183, 0.0173,
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1900, -2.3, 2.06, 0.169, -0.0135,
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1920, 21.2, 1.69, -0.304, 0.0167,
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1940, 24.2, 1.22, -0.064, 0.0031,
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1960, 33.2, 0.51, 0.231, -0.0109,
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1980, 51.0, 1.29, -0.026, 0.0032,
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2000, 63.87, 0.1, 0, 0,
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2005, 64.7, 0.4, 0, 0, //一次项记为x,则 10x=0.4秒/年*(2015-2005),解得x=0.4
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2015, 69,
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}
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y0 := dt_at[len(dt_at)-2] //表中最后一年
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t0 := dt_at[len(dt_at)-1] //表中最后一年的 deltatT
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if y >= y0 {
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jsd := float64(31) // sjd是y1年之后的加速度估计
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// 瑞士星历表jsd=31, NASA网站jsd=32, skmap的jsd=29
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if y > y0+100.00 {
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return dt_ext(y, jsd)
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}
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v := dt_ext(y, jsd) //二次曲线外推
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dv := dt_ext(y0, jsd) - t0 // ye年的二次外推与te的差
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return (v - dv*(y0+100.00-y)/100.00)
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}
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d := dt_at
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var i int
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for i = 0; i < len(d); i += 5 {
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if float64(y) < d[i+5] {
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break
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// 判断年所在的区间
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}
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}
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t1 := (y - d[i]) / (d[i+5] - d[i]) * 10.00 //////// 三次插值, 保证精确性
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t2 := t1 * t1
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t3 := t2 * t1
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res := d[i+1] + d[i+2]*t1 + d[i+3]*t2 + d[i+4]*t3
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return (res)
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}
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func DeltaT(date float64, isJDE bool) float64 {
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return defDeltaTFn(date, isJDE)
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}
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func SetDeltaTFn(fn func(float64, bool) float64) {
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if fn != nil {
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defDeltaTFn = fn
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}
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}
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func GetDeltaTFn() func(float64, bool) float64 {
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return defDeltaTFn
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}
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func OldDefaultDeltaT(Date float64, IsJDE bool) (Result float64) { //传入年或儒略日,传出为秒
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var Year float64
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if IsJDE {
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dates := JDE2Date(Date)
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Year = float64(dates.Year()) + float64(dates.YearDay())/365.0
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} else {
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Year = Date
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}
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if Year < 2100 && Year >= 2010 {
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return dt_cal(Year)
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}
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return DefaultDeltaT(Date, IsJDE)
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}
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func DefaultDeltaT(Date float64, IsJDE bool) (Result float64) { //传入年或儒略日,传出为秒
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var Year float64
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if IsJDE {
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dates := JDE2Date(Date)
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Year = float64(dates.Year()) + float64(dates.YearDay())/365.0
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} else {
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Year = Date
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}
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if Year < 2010 {
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Result = dt_cal(Year)
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return
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}
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if Year < 2100 && Year >= 2010 {
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var t = (Year - 2000.0)
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Result = 62.92 + 0.32217*t + 0.005589*t*t
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return
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}
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if Year >= 2100 && Year <= 2150 {
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Result = -20 + 32*(((Year-1820.0)/100.0)*((Year-1820.0)/100.0)) - 0.5628*(2150-Year)
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return
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}
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if Year > 2150 {
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//tmp=(Year-1820)/100;
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//Result= -20 + 32 * tmp*tmp;
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Result = dt_cal(Year)
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return
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}
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return
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}
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func TD2UT(JDE float64, UT2TD bool) float64 { // true 世界时转力学时CC,false 力学时转世界时VV
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Deltat := DeltaT(JDE, true)
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if UT2TD {
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return JDE + Deltat/3600/24
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} else {
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return JDE - Deltat/3600/24
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}
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}
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/*
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* @name: JDE转日期,输出为数组
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*/
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func JDE2Date(JD float64) time.Time {
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JD = JD + 0.5
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Z := float64(int(JD))
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F := JD - Z
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var A, B, Years, Months, Days float64
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if Z < 2299161.0 {
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A = Z
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} else {
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alpha := math.Floor((Z - 1867216.25) / 36524.25)
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A = Z + 1 + alpha - math.Floor(alpha/4)
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}
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B = A + 1524
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C := math.Floor((B - 122.1) / 365.25)
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D := math.Floor(365.25 * C)
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E := math.Floor((B - D) / 30.6001)
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Days = B - D - math.Floor(30.6001*E) + F
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if E < 14 {
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Months = E - 1
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}
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if E == 14 || E == 15 {
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Months = E - 13
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}
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if Months > 2 {
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Years = C - 4716
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}
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if Months == 1 || Months == 2 {
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Years = C - 4715
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}
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tms := (Days - math.Floor(Days)) * 24 * 3600
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Days = math.Floor(Days)
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tz, _ := time.LoadLocation("Local")
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dates := time.Date(int(Years), time.Month(int(Months)), int(Days), 0, 0, 0, 0, tz)
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return time.Unix(dates.Unix()+int64(tms), int64((tms-math.Floor(tms))*1000000000))
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}
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// JDE2DateByZone JDE(儒略日)转日期
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// JD: 儒略日
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// tz: 目标时区
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// byZone: (true: 传入的儒略日视为目标时区当地时间的儒略日,false: 传入的儒略日视为UTC时间的儒略日)
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// 回参:转换后的日期,时区始终为目标时区
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func JDE2DateByZone(JD float64, tz *time.Location, byZone bool) time.Time {
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JD = JD + 0.5
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Z := float64(int(JD))
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F := JD - Z
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var A, B, Years, Months, Days float64
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if Z < 2299161.0 {
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A = Z
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} else {
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alpha := math.Floor((Z - 1867216.25) / 36524.25)
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A = Z + 1 + alpha - math.Floor(alpha/4)
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}
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B = A + 1524
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C := math.Floor((B - 122.1) / 365.25)
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D := math.Floor(365.25 * C)
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E := math.Floor((B - D) / 30.6001)
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Days = B - D - math.Floor(30.6001*E) + F
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if E < 14 {
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Months = E - 1
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}
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if E == 14 || E == 15 {
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Months = E - 13
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}
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if Months > 2 {
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Years = C - 4716
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}
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if Months == 1 || Months == 2 {
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Years = C - 4715
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}
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tms := (Days - math.Floor(Days)) * 24 * 3600
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Days = math.Floor(Days)
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var transTz = tz
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if !byZone {
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transTz = time.UTC
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}
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return time.Date(int(Years), time.Month(int(Months)), int(Days), 0, 0, 0, 0, transTz).
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Add(time.Duration(int64(1000000000 * tms))).In(tz)
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}
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func GetLunar(year, month, day int, tz float64) (lmonth, lday int, leap bool, result string) {
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jde := JDECalc(year, month, float64(day)) //计算当前JDE时间
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if month == 11 || month == 12 { //判断当前日期属于前一年周期还是后一年周期
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//判断方法:当前日期与冬至日所在朔望月的关系
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winterday := GetJQTime(year, 270) + tz //冬至日日期(世界时,北京时间)
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Fday := TD2UT(CalcMoonS(float64(year)+11.0/12.0+5.0/30.0/12.0, 0), true) + tz //朔月(世界时,北京时间)
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Yday := TD2UT(CalcMoonS(float64(year)+1.0, 0), true) + tz //下一朔月(世界时,北京时间)
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if Fday-math.Floor(Fday) > 0.5 {
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Fday = math.Floor(Fday) + 0.5
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} else {
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Fday = math.Floor(Fday) - 0.5
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}
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if Yday-math.Floor(Yday) > 0.5 {
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Yday = math.Floor(Yday) + 0.5
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} else {
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Yday = math.Floor(Yday) - 0.5
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}
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if winterday >= Fday && winterday < Yday && jde <= Fday {
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year--
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}
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if winterday >= Yday && jde < Yday {
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year--
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}
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} else {
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year--
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}
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jieqi := GetJieqiLoops(year, 25) //一年的节气
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moon := GetMoonLoops(float64(year), 17) //一年朔月日
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winter1 := jieqi[0] - 8.0/24 + tz //第一年冬至日
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winter2 := jieqi[24] - 8.0/24 + tz //第二年冬至日
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for idx, v := range moon {
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if tz != 8.0/24 {
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v = v - 8.0/24 + tz
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}
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if v-math.Floor(v) > 0.5 {
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moon[idx] = math.Floor(v) + 0.5
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} else {
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moon[idx] = math.Floor(v) - 0.5
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}
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} //置闰月为0点
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for idx, v := range jieqi {
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if tz != 8.0/24 {
|
|
|
|
|
v = v - 8.0/24 + tz
|
|
|
|
|
}
|
|
|
|
|
if v-math.Floor(v) > 0.5 {
|
|
|
|
|
jieqi[idx] = math.Floor(v) + 0.5
|
|
|
|
|
} else {
|
|
|
|
|
jieqi[idx] = math.Floor(v) - 0.5
|
|
|
|
|
}
|
|
|
|
|
} //置节气为0点
|
|
|
|
|
mooncount := 0 //年内朔望月计数
|
|
|
|
|
var min, max int = 20, 0 //最大最小计数
|
|
|
|
|
for i := 0; i < 15; i++ {
|
|
|
|
|
if moon[i] >= winter1 && moon[i] < winter2 {
|
|
|
|
|
if i <= min {
|
|
|
|
|
min = i
|
|
|
|
|
}
|
|
|
|
|
if i >= max {
|
|
|
|
|
max = i
|
|
|
|
|
}
|
|
|
|
|
mooncount++
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
leapmonth := 20
|
|
|
|
|
if mooncount == 13 { //存在闰月
|
|
|
|
|
var j, i = 2, 0
|
|
|
|
|
for i = min; i <= max; i++ {
|
|
|
|
|
if !(moon[i] <= jieqi[j] && moon[i+1] > jieqi[j]) {
|
|
|
|
|
break
|
|
|
|
|
}
|
|
|
|
|
j += 2
|
|
|
|
|
}
|
|
|
|
|
leapmonth = i - min + 1
|
|
|
|
|
}
|
|
|
|
|
i := 0
|
|
|
|
|
for i = min - 1; i <= max; i++ {
|
|
|
|
|
if moon[i] > jde {
|
|
|
|
|
break
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
lmonth = i - min
|
|
|
|
|
var sleap bool = false
|
|
|
|
|
leap = false
|
|
|
|
|
if lmonth >= leapmonth {
|
|
|
|
|
sleap = true
|
|
|
|
|
}
|
|
|
|
|
if lmonth == leapmonth {
|
|
|
|
|
leap = true
|
|
|
|
|
}
|
|
|
|
|
if lmonth < 2 {
|
|
|
|
|
lmonth += 11
|
|
|
|
|
} else {
|
|
|
|
|
lmonth--
|
|
|
|
|
}
|
|
|
|
|
if sleap {
|
|
|
|
|
lmonth--
|
|
|
|
|
}
|
|
|
|
|
if lmonth <= 0 {
|
|
|
|
|
lmonth += 12
|
|
|
|
|
}
|
|
|
|
|
lday = int(jde-moon[i-1]) + 1
|
|
|
|
|
strmonth := []string{"十", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "腊"}
|
|
|
|
|
strday := []string{"初", "十", "廿", "三"}
|
|
|
|
|
if leap {
|
|
|
|
|
result += "闰"
|
|
|
|
|
}
|
|
|
|
|
if lmonth == 1 {
|
|
|
|
|
result += "正月"
|
|
|
|
|
} else {
|
|
|
|
|
result += strmonth[lmonth] + "月"
|
|
|
|
|
}
|
|
|
|
|
if lday == 20 {
|
|
|
|
|
result += "二十"
|
|
|
|
|
} else if lday == 10 {
|
|
|
|
|
result += "初十"
|
|
|
|
|
} else {
|
|
|
|
|
result += strday[lday/10] + strmonth[lday%10]
|
|
|
|
|
}
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func GetSolar(year, month, day int, leap bool, tz float64) float64 {
|
|
|
|
|
if month < 11 {
|
|
|
|
|
year--
|
|
|
|
|
}
|
|
|
|
|
jieqi := GetJieqiLoops(year, 25) //一年的节气
|
|
|
|
|
moon := GetMoonLoops(float64(year), 17) //一年朔月日
|
|
|
|
|
winter1 := jieqi[0] - 8.0/24 + tz //第一年冬至日
|
|
|
|
|
winter2 := jieqi[24] - 8.0/24 + tz //第二年冬至日
|
|
|
|
|
for idx, v := range moon {
|
|
|
|
|
if tz != 8.0/24 {
|
|
|
|
|
v = v - 8.0/24 + tz
|
|
|
|
|
}
|
|
|
|
|
if v-math.Floor(v) > 0.5 {
|
|
|
|
|
moon[idx] = math.Floor(v) + 0.5
|
|
|
|
|
} else {
|
|
|
|
|
moon[idx] = math.Floor(v) - 0.5
|
|
|
|
|
}
|
|
|
|
|
} //置闰月为0点
|
|
|
|
|
for idx, v := range jieqi {
|
|
|
|
|
if tz != 8.0/24 {
|
|
|
|
|
v = v - 8.0/24 + tz
|
|
|
|
|
}
|
|
|
|
|
if v-math.Floor(v) > 0.5 {
|
|
|
|
|
jieqi[idx] = math.Floor(v) + 0.5
|
|
|
|
|
} else {
|
|
|
|
|
jieqi[idx] = math.Floor(v) - 0.5
|
|
|
|
|
}
|
|
|
|
|
} //置节气为0点
|
|
|
|
|
mooncount := 0 //年内朔望月计数
|
|
|
|
|
var min, max int = 20, 0 //最大最小计数
|
|
|
|
|
for i := 0; i < 15; i++ {
|
|
|
|
|
if moon[i] >= winter1 && moon[i] < winter2 {
|
|
|
|
|
if i <= min {
|
|
|
|
|
min = i
|
|
|
|
|
}
|
|
|
|
|
if i >= max {
|
|
|
|
|
max = i
|
|
|
|
|
}
|
|
|
|
|
mooncount++
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
leapmonth := 20
|
|
|
|
|
if mooncount == 13 { //存在闰月
|
|
|
|
|
var j, i = 2, 0
|
|
|
|
|
for i = min; i <= max; i++ {
|
|
|
|
|
if !(moon[i] <= jieqi[j] && moon[i+1] > jieqi[j]) {
|
|
|
|
|
break
|
|
|
|
|
}
|
|
|
|
|
j += 2
|
|
|
|
|
}
|
|
|
|
|
leapmonth = i - min + 1
|
|
|
|
|
}
|
|
|
|
|
if leap {
|
|
|
|
|
month++
|
|
|
|
|
}
|
|
|
|
|
if month > 10 {
|
|
|
|
|
month -= 11
|
|
|
|
|
} else {
|
|
|
|
|
month++
|
|
|
|
|
}
|
|
|
|
|
if month >= leapmonth && !leap {
|
|
|
|
|
month++
|
|
|
|
|
}
|
|
|
|
|
jde := moon[min-1+month] + float64(day) - 1
|
|
|
|
|
return jde
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Date2JDE 日期转儒略日
|
|
|
|
|
func Date2JDE(date time.Time) float64 {
|
|
|
|
|
day := float64(date.Day()) + float64(date.Hour())/24.0 + float64(date.Minute())/24.0/60.0 + float64(date.Second())/24.0/3600.0 + float64(date.Nanosecond())/1000000000.0/3600.0/24.0
|
|
|
|
|
return JDECalc(date.Year(), int(date.Month()), day)
|
|
|
|
|
}
|