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fix ThetaG_JD calculation #2

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Sep 24, 2018
Merged

fix ThetaG_JD calculation #2

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2 changes: 1 addition & 1 deletion conversions.go
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ func LatLongDeg(rad LatLong) (deg LatLong) {
// Calculate GMST from Julian date.
// Reference: The 1992 Astronomical Almanac, page B6.
func ThetaG_JD(jday float64) (ret float64) {
UT := jday + 0.5 - jday
_, UT := math.Modf(jday + 0.5)
jday = jday - UT
TU := (jday - 2451545.0) / 36525.0
GMST := 24110.54841 + TU*(8640184.812866+TU*(0.093104-TU*6.2e-6))
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