starainrt
3ffdbe0034
- 新增日食、月食、本地可见性、中心线、半影区域、SVG 图示与沙罗周期信息 - 新增行星冲合、留、方照、物理星历、视直径、相位、亮肢角、轨道节点等计算 - 新增木星伽利略卫星位置、现象与接触事件计算 - 新增恒星星表、星座判定、自行修正与观测辅助能力 - 新增 coord、formula、orbit、sundial、lite/sun、lite/moon 等扩展包 - 完善农历年号、月相英文别名、视差角、大气质量、折射、日晷与双星计算 - 增加 NASA、JPL Horizons、IMCCE 等回归测试数据与基线测试 - 重构基础算法文件组织，补充大量公开 API 注释和语义回归测试 - 更新中文和英文 README，补充示例、精度说明、SVG 配图
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package basic
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import "math"
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func GetMoonLoops(year float64, loop int) []float64 {
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var start float64
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var newMoon, lastNewMoon float64
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moonLoops := make([]float64, loop)
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if year < 6000 {
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start = year + 11.00/12.00 + 5.00/30.00/12.00
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} else {
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start = year + 9.00/12.00 + 5.00/30.00/12.00
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}
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i := 1
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for j := 0; j < loop; j++ {
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if year > 3000 {
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newMoon = TD2UT(CalcMoonSH(start+float64(i-1)/12.5, 0)+8.0/24.0, false)
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} else {
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newMoon = TD2UT(CalcMoonS(start+float64(i-1)/12.5, 0)+8.0/24.0, false)
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}
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if i != 1 {
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if newMoon == lastNewMoon {
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j--
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i++
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continue
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}
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}
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moonLoops[j] = newMoon
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lastNewMoon = moonLoops[j]
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i++
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}
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return moonLoops
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}
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func GetJieqiLoops(year, loop int) []float64 {
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start := 270
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jq := make([]float64, loop)
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for i := 1; i <= loop; i++ {
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angle := start + 15*(i-1)
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if angle > 360 {
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angle -= 360
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}
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jq[i-1] = GetJQTime(year+int(math.Ceil(float64(i-1)/24.000)), angle) + 8.0/24.0
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}
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return jq
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}
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func GetJQTime(year, angle int) float64 {
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// Calculate initial day based on angle parity
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var initialDay float64
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if angle%2 == 0 {
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initialDay = 18
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} else {
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initialDay = 3
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}
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// Calculate temporary factor for month offset
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var tempFactor float64
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if angle%10 != 0 {
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tempFactor = float64(angle+15) / 30.0
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} else {
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tempFactor = float64(angle) / 30.0
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}
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// Calculate initial month, adjusting if超过 12
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initialMonth := 3.0 + tempFactor
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if initialMonth > 12.0 {
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initialMonth -= 12.0
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}
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// Calculate initial Julian date
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initialJD := JDECalc(year, int(initialMonth), initialDay)
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// Set target angle for iteration; if angle is 0, use 360
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targetAngle := float64(angle)
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if angle == 0 {
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targetAngle = 360.0
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}
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// Newton-Raphson iteration to find precise Julian date
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currentJD := initialJD
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for {
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previousJD := currentJD
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errorValue := JQLospec(previousJD, targetAngle) - targetAngle
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derivative := (JQLospec(previousJD+0.000005, targetAngle) - JQLospec(previousJD-0.000005, targetAngle)) / 0.00001
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currentJD = previousJD - errorValue/derivative
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// Check for convergence
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if math.Abs(currentJD-previousJD) <= 0.00001 {
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break
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}
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}
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// Convert to UT and return
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return TD2UT(currentJD, false)
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}
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func JQLospec(jd float64, target float64) float64 {
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sunLo := HSunApparentLo(jd)
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if target >= 345 {
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if sunLo <= 12 {
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sunLo += 360
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}
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} else if target <= 15 {
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if sunLo >= 350 {
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sunLo -= 360
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}
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}
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return sunLo
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}
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