b612
2bf8478639
- 新增日月食中心带、偏食带、阴影足迹、等时线、食分线及升落边界计算，支持极区与混合食拓扑 - 新增日食单时刻阴影求解器、站心状态查询、批量采样和 ΔT 覆盖接口 - 重构恒星与行星月掩路径，补充有限盘面接触、站心修正、掩带宽度、极区投影及升落边界 - 扩展 SVG 与 GeoJSON 输出，支持详细面板、全球/极区/地球投影、边界闭合、时间标记和拓扑签名 - 扩展日月食候选搜索、局地搜索、沙罗序列预计算与范围外推，补充系列锚点和成员一致性校验 - 补齐古历纪年、儒略历独有闰日、多公历候选、历法改革跨日及精确日期运算接口 - 优化 ΔT、章动、恒星时、月球地平线、事件根搜索和本地星历缓存，降低重复计算开销并提升边界稳定
206 lines
5.2 KiB
Go
206 lines
5.2 KiB
Go
package basic
|
||
|
||
import (
|
||
"b612.me/astro/planet"
|
||
. "b612.me/astro/tools"
|
||
)
|
||
|
||
// SunLo 太阳几何黄经
|
||
func SunLo(jd float64) float64 {
|
||
return planet.SunLo(jd)
|
||
}
|
||
|
||
func SunM(jd float64) float64 {
|
||
return planet.SunM(jd)
|
||
}
|
||
|
||
/*
|
||
@name 地球偏心率
|
||
*/
|
||
func Earthe(jd float64) float64 { //'地球偏心率
|
||
return planet.Earthe(jd)
|
||
}
|
||
|
||
func EarthPI(jd float64) float64 { //近日點經度
|
||
return planet.EarthPI(jd)
|
||
}
|
||
|
||
func SunMidFun(jd float64) float64 { //'太阳中间方程
|
||
return planet.SunMidFun(jd)
|
||
}
|
||
|
||
func SunTrueLo(jd float64) float64 { // '太阳真黄经
|
||
return planet.SunTrueLo(jd)
|
||
}
|
||
|
||
func SunApparentLo(jd float64) float64 { //'太阳视黄经
|
||
return planet.SunApparentLo(jd)
|
||
}
|
||
|
||
func SunApparentRa(jd float64) float64 { // '太阳视赤经
|
||
return LoToRa(jd, SunApparentLo(jd), 0)
|
||
}
|
||
|
||
func SunApparentRaDec(jd float64) (float64, float64) {
|
||
return LoBoToRaDec(jd, SunApparentLo(jd), 0)
|
||
}
|
||
|
||
func SunTrueRa(jd float64) float64 { //'太阳真赤经
|
||
eps := TrueObliquity(jd)
|
||
sunTrueRa := ArcTan(Cos(eps) * Sin(SunTrueLo(jd)) / Cos(SunTrueLo(jd)))
|
||
//Select Case SunTrueLo(JD)
|
||
sunTrueLo := SunTrueLo(jd)
|
||
if sunTrueLo >= 90 && sunTrueLo < 180 {
|
||
sunTrueRa = 180 + sunTrueRa
|
||
} else if sunTrueLo >= 180 && sunTrueLo < 270 {
|
||
sunTrueRa = 180 + sunTrueRa
|
||
} else if sunTrueLo >= 270 && sunTrueLo <= 360 {
|
||
sunTrueRa = 360 + sunTrueRa
|
||
}
|
||
return sunTrueRa
|
||
}
|
||
|
||
func SunApparentDec(jd float64) float64 { // '太阳视赤纬
|
||
// TrueObliquity 已是“平交角 + 交角章动”，不能再加 0.00256*cos(Ω)：
|
||
// 那一项就是交角章动的近似值（见《天文算法》24 章译者注），加了会把章动计两次。
|
||
eps := TrueObliquity(jd)
|
||
sunApparentDec := ArcSin(Sin(eps) * Sin(SunApparentLo(jd)))
|
||
return sunApparentDec
|
||
}
|
||
|
||
func SunTrueDec(jd float64) float64 { // '太阳真赤纬
|
||
eps := TrueObliquity(jd)
|
||
sunTrueDec := ArcSin(Sin(eps) * Sin(SunTrueLo(jd)))
|
||
return sunTrueDec
|
||
}
|
||
|
||
func SunTime(jd float64) float64 { //均时差
|
||
tm := (SunLo(jd) - 0.0057183 - (HSunApparentRa(jd)) + (Nutation2000Bi(jd))*Cos(TrueObliquity(jd))) / 15
|
||
if tm > 23 {
|
||
tm = -24 + tm
|
||
}
|
||
return tm
|
||
}
|
||
|
||
func SunTimeN(jd float64, n int) float64 { //均时差
|
||
tm := (SunLo(jd) - 0.0057183 - (HSunApparentRaN(jd, n)) + (Nutation2000Bi(jd))*Cos(TrueObliquity(jd))) / 15
|
||
if tm > 23 {
|
||
tm = -24 + tm
|
||
}
|
||
return tm
|
||
}
|
||
|
||
func SunSC(lo, jd float64) float64 { //黄道上的岁差，仅黄纬=0时
|
||
t := (jd - 2451545) / 36525
|
||
//n := 47.0029/3600*t - 0.03302/3600*t*t + 0.000060/3600*t*t*t
|
||
//m := 174.876384/3600 - 869.8089/3600*t + 0.03536/3600*t*t
|
||
pk := 5029.0966/3600.00*t + 1.11113/3600.00*t*t - 0.000006/3600.00*t*t*t
|
||
return lo + pk
|
||
}
|
||
|
||
// 高精度，使用VSOP87
|
||
func HSunTrueLo(jd float64) float64 {
|
||
return HSunTrueLoN(jd, -1)
|
||
}
|
||
|
||
// HSunTrueLoN 高精度太阳真黄经，n<0 时取全量 VSOP 项。
|
||
func HSunTrueLoN(jd float64, n int) float64 {
|
||
return planet.WherePlanetN(0, 0, jd, n)
|
||
}
|
||
|
||
func HSunTrueBo(jd float64) float64 {
|
||
return HSunTrueBoN(jd, -1)
|
||
}
|
||
|
||
// HSunTrueBoN 高精度太阳真黄纬，n<0 时取全量 VSOP 项。
|
||
func HSunTrueBoN(jd float64, n int) float64 {
|
||
return planet.WherePlanetN(0, 1, jd, n)
|
||
}
|
||
|
||
func HSunApparentLo(jd float64) float64 {
|
||
return HSunApparentLoN(jd, -1)
|
||
}
|
||
|
||
func HSunApparentLoN(jd float64, n int) float64 {
|
||
lo := HSunTrueLoN(jd, n)
|
||
lo = lo + Nutation2000Bi(jd) + SunLoGXCN(jd, n)
|
||
return lo
|
||
}
|
||
|
||
func SunLoGXC(jd float64) float64 {
|
||
return SunLoGXCN(jd, -1)
|
||
}
|
||
|
||
func SunLoGXCN(jd float64, n int) float64 {
|
||
radius := EarthAwayN(jd, n)
|
||
return -20.49552 / radius / 3600
|
||
}
|
||
|
||
func EarthAway(jd float64) float64 {
|
||
return EarthAwayN(jd, -1)
|
||
}
|
||
|
||
func EarthAwayN(jd float64, n int) float64 {
|
||
return planet.WherePlanetN(0, 2, jd, n)
|
||
}
|
||
|
||
func HSunApparentRaDec(jd float64) (float64, float64) {
|
||
return HSunApparentRaDecN(jd, -1)
|
||
}
|
||
|
||
func HSunApparentRaDecN(jd float64, n int) (float64, float64) {
|
||
ra, dec, _ := hSunApparentRaDecDistanceN(jd, n)
|
||
return ra, dec
|
||
}
|
||
|
||
func hSunApparentRaDecDistanceN(jd float64, n int) (ra, dec, distanceAU float64) {
|
||
trueLongitude := HSunTrueLoN(jd, n)
|
||
trueLatitude := HSunTrueBoN(jd, n)
|
||
distanceAU = EarthAwayN(jd, n)
|
||
apparentLongitude := trueLongitude + Nutation2000Bi(jd) - 20.49552/distanceAU/3600
|
||
ra, dec = LoBoToRaDec(jd, apparentLongitude, trueLatitude)
|
||
return ra, dec, distanceAU
|
||
}
|
||
|
||
func HSunApparentRa(jd float64) float64 { // '太阳视赤经
|
||
return HSunApparentRaN(jd, -1)
|
||
}
|
||
|
||
func HSunApparentRaN(jd float64, n int) float64 { // '太阳视赤经
|
||
return LoToRa(jd, HSunApparentLoN(jd, n), HSunTrueBoN(jd, n))
|
||
}
|
||
|
||
func HSunTrueRa(jd float64) float64 {
|
||
return HSunTrueRaN(jd, -1)
|
||
}
|
||
|
||
func HSunTrueRaN(jd float64, n int) float64 {
|
||
sunTrueLo := HSunTrueLoN(jd, n)
|
||
eps := TrueObliquity(jd)
|
||
|
||
numerator := Cos(eps) * Sin(sunTrueLo)
|
||
denominator := Cos(sunTrueLo)
|
||
|
||
return ArcTan2(numerator, denominator)
|
||
}
|
||
|
||
func HSunApparentDec(jd float64) float64 { // '太阳视赤纬
|
||
return HSunApparentDecN(jd, -1)
|
||
}
|
||
|
||
func HSunApparentDecN(jd float64, n int) float64 { // '太阳视赤纬
|
||
return ArcSin(Sin(EclipticObliquity(jd, true)) * Sin(HSunApparentLoN(jd, n)))
|
||
}
|
||
|
||
func HSunTrueDec(jd float64) float64 { // '太阳真赤纬
|
||
return HSunTrueDecN(jd, -1)
|
||
}
|
||
|
||
func HSunTrueDecN(jd float64, n int) float64 { // '太阳真赤纬
|
||
return ArcSin(Sin(EclipticObliquity(jd, false)) * Sin(HSunTrueLoN(jd, n)))
|
||
}
|
||
|
||
func Distance(jd float64) float64 { //ri di ju li
|
||
return planet.Distance(jd)
|
||
}
|