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change delta T formula and add planet phenomena function

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兔子
2022-05-16 20:42:15 +08:00
parent bb07e23238
commit 97c017be08
38 changed files with 4700 additions and 779 deletions
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basic/star.go
+13 -1
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@@ -150,7 +150,7 @@ func StarCulminationTime(jde, ra, lon, timezone float64) float64 {
for {
JD0 := JD1
stDegree := limitStarHA(JD0, ra, lon, timezone) - 360
stDegreep := (limitStarHA(JD0+0.000005, ra, lon, timezone) - SunHeight(JD0-0.000005, ra, lon, timezone)) / 0.00001
stDegreep := (limitStarHA(JD0+0.000005, ra, lon, timezone) - limitStarHA(JD0-0.000005, ra, lon, timezone)) / 0.00001
JD1 = JD0 - stDegree/stDegreep
if math.Abs(JD1-JD0) <= 0.00001 {
break
@@ -158,3 +158,15 @@ func StarCulminationTime(jde, ra, lon, timezone float64) float64 {
}
return JD1
}
func StarAngularSeparation(ra1, dec1, ra2, dec2 float64) float64 {
//cos(d)=sinδ1 sinδ2 + cosδ1 cosδ2 cos(α1-α2)
d := Sin(dec1)*Sin(dec2) + Cos(dec1)*Cos(dec2)*Cos(ra1-ra2)
if math.Abs(d) >= 0.999999997 {
//d = √(Δα*cosδ)2+(Δδ)2
tmp1 := ((ra1 - ra2) * Cos((dec1+dec2)/2))
tmp2 := (dec1 - dec2)
return math.Sqrt(tmp1*tmp1 + tmp2*tmp2)
}
return ArcCos(d)
}