code: func calcGeomMeanLongSun(julianCentury []float64) (geomMeanLongSun []float64) {
  	for index := 0; index < len(julianCentury); index++ {
  		a := 280.46646 + julianCentury[index]*(36000.76983+julianCentury[index]*0.0003032)
  		temp := math.Mod(a, 360.0)
  		geomMeanLongSun = append(geomMeanLongSun, temp)
  	}
  	return
  }
docs: // Calculate the Geom Mean Long Sun in degrees based on the formula: 280.46646 + julianCentury * (36000.76983 + julianCentury * 0.0003032)
  // julianCentury - Julian century calculated by the calcJulianCentury function
  // Return The Geom Mean Long Sun slice