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package basic
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import (
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"math"
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. "b612.me/astro/tools"
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)
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/*
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* 坐标变换，黄道转赤道
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*/
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func LoToRa(lo, bo, jde float64) float64 {
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ra := math.Atan2(Sin(lo)*Cos(Sita(jde)-Tan(bo)*Sin(Sita(jde))), Cos(lo))
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ra = ra * 180 / math.Pi
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if ra < 0 {
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ra += 360
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}
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return ra
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}
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func BoToDec(lo, bo, jde float64) float64 {
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dec := ArcSin(Sin(bo)*Cos(Sita(jde)) + Cos(bo)*Sin(Sita(jde))*Sin(lo))
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return dec
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}
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/*
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* 赤道坐标岁差变换st end 为JDE时刻
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*/
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func ZuoBiaoSuiCha(ra, dec, st, end float64) (float64, float64) {
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t := (end - st) / 36525.0
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l := (2306.2181*t + 0.30188*t*t + 0.017998*t*t*t) / 3600
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z := (2306.2181*t + 1.09468*t*t + 0.018203*t*t*t) / 3600
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o := (2004.3109*t - 0.42665*t*t + 0.041833*t*t*t) / 3600
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A := Cos(dec) * Sin(ra+l)
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B := Cos(o)*Cos(dec)*Cos(ra+l) - Sin(o)*Sin(dec)
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C := Sin(o)*Cos(dec)*Cos(ra+l) + Cos(o)*Sin(dec)
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ras := math.Atan2(A, B)
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ras = ras * 180 / math.Pi
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if ras < 0 {
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ras += 360
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}
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ra = ras + z
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dec = ArcSin(C)
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return ra, dec
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}
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/*
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* 地心坐标转站心坐标，参数分别为，地心赤经赤纬 纬度经度，jde，离地心位置au
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*/
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func pcosi(lat, h float64) float64 {
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b := 6356.755
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a := 6378.14
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u := ArcTan(b / a * Tan(lat))
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//psin=b/a*Sin(u)+h/6378140*Sin(lat);
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pcos := Cos(u) + h/6378140.0*Cos(lat)
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return pcos
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}
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func psini(lat, h float64) float64 {
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b := 6356.755
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a := 6378.14
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u := ArcTan(b / a * Tan(lat))
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psin := b/a*Sin(u) + h/6378140*Sin(lat)
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//pcos=Cos(u)+h/6378140*Cos(lat);
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return psin
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}
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func ZhanXinRaDec(ra, dec, lat, lon, jd, au, h float64) (float64, float64) {
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sinpi := Sin(0.0024427777777) / au
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pcosi := pcosi(lat, h)
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psini := psini(lat, h)
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tH := Limit360(TD2UT(SeeStarTime(jd), false)*15 + lon - ra)
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nra := math.Atan2(-pcosi*sinpi*Sin(tH), (Cos(dec)-pcosi*sinpi*Cos(tH))) * 180 / math.Pi
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ndec := math.Atan2((Sin(dec)-psini*sinpi)*Cos(nra), (Cos(dec)-pcosi*sinpi*Cos(tH))) * 180 / math.Pi
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return ra + nra, ndec
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}
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func ZhanXinRa(ra, dec, lat, lon, jd, au, h float64) float64 { //jd为格林尼治标准时
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sinpi := Sin(0.0024427777777) / au
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pcosi := pcosi(lat, h)
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tH := Limit360(TD2UT(SeeStarTime(jd), false)*15 + lon - ra)
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nra := math.Atan2(-pcosi*sinpi*Sin(tH), (Cos(dec)-pcosi*sinpi*Cos(tH))) * 180 / math.Pi
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return ra + nra
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}
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func ZhanXinDec(ra, dec, lat, lon, jd, au, h float64) float64 { //jd为格林尼治标准时
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sinpi := Sin(0.0024427777777) / au
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pcosi := pcosi(lat, h)
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psini := psini(lat, h)
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tH := Limit360(TD2UT(SeeStarTime(jd), false)*15 + lon - ra)
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nra := math.Atan2(-pcosi*sinpi*Sin(tH), (Cos(dec)-pcosi*sinpi*Cos(tH))) * 180 / math.Pi
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ndec := math.Atan2((Sin(dec)-psini*sinpi)*Cos(nra), (Cos(dec)-pcosi*sinpi*Cos(tH))) * 180 / math.Pi
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return ndec
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}
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func ZhanXinLo(lo, bo, lat, lon, jd, au, h float64) float64 { //jd为格林尼治标准时
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C := pcosi(lat, h)
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S := psini(lat, h)
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sinpi := Sin(0.0024427777777) / au
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ra := LoToRa(lo, bo, jd)
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tH := Limit360(TD2UT(SeeStarTime(jd), false)*15 + lon - ra)
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N := Cos(lo)*Cos(bo) - C*sinpi*Cos(tH)
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nlo := math.Atan2(Sin(lo)*Cos(bo)-sinpi*(S*Sin(Sita(jd))+C*Cos(Sita(jd))*Sin(tH)), N) * 180 / math.Pi
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return nlo
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}
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func ZhanXinBo(lo, bo, lat, lon, jd, au, h float64) float64 { //jd为格林尼治标准时
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C := pcosi(lat, h)
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S := psini(lat, h)
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sinpi := Sin(0.0024427777777) / au
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ra := LoToRa(lo, bo, jd)
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tH := Limit360(TD2UT(SeeStarTime(jd), false)*15 + lon - ra)
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N := Cos(lo)*Cos(bo) - C*sinpi*Cos(tH)
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nlo := math.Atan2(Sin(lo)*Cos(bo)-sinpi*(S*Sin(Sita(jd))+C*Cos(Sita(jd))*Sin(tH)), N) * 180 / math.Pi
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nbo := math.Atan2(Cos(nlo)*(Sin(bo)-sinpi*(S*Cos(Sita(jd))-C*Sin(Sita(jd))*Sin(tH))), N) * 180 / math.Pi
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return nbo
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}
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/*
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func GXCLo(lo,bo,jd float64) float64{ //光行差修正
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k:=20.49552;
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sunlo:=SunTrueLo(jd);
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e:=Earthe(jd);
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epi=earth->EarthPI(jd);
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tmp=(-k*this->CosR(sunlo-lo)+e*k*this->CosR(epi-lo))/this->CosR(bo);
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return tmp;
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}
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public function GXCBo(lo,bo,jd)
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{
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earth=new Earth();
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k=20.49552;
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sunlo=earth->SunTrueLo(jd);
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e=earth->Earthe(jd);
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epi=earth->EarthPI(jd);
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tmp=-k*this->SinR(bo)*(this->SinR(sunlo-lo)-e*this->SinR(epi-lo));
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return tmp;
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}
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*/
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