Java Question Converting a routine to Java

'Returns the equation of time in minutes decimal.
'x = Date in Ticks, such as DateTme.Now
Public Sub GetEOT(x As Long) As Double
   'ref [url=http://en.wikipedia.org/wiki/Equation_of_time]Equation of time - Wikipedia, the free encyclopedia[/url]
   Dim w, a, b, c As Double
   Dim n As Int
   n = DateTime.GetDayOfYear(x)
   w = 360 / 365.242199
   a = w * (n + 10)
   b = a + 1.9149659 * SinD(w * (n-2)) '1.91... = 360 / cPI * 0.0167... ecc of earth
   c = (a - ATanD(TanD(b) / CosD(23.43755447))) / 180
   Return 720 * (c - Round(c))
End Sub

/**
 * Returns the equation of time in minutes decimal.
 * @param x Ticks
 * @return EOT
 */
public double GetEOT(long x) {
   //ref [url=http://en.wikipedia.org/wiki/Equation_of_time]Equation of time - Wikipedia, the free encyclopedia[/url]
   int n = DateTime.GetDayOfYear(x);   //returned day of year is correct
   double w = 360 / 365.242199;
   double a = w * (n + 10);
   double b = a + 1.9149659 * Math.sin((w/Rad) * (n-2));   // Rad = 57.3
   double c = (a - Math.atan(Math.tan(b/Rad) / Math.cos(23.43755447/Rad))) / 180;
   double eot =  720 * (c - Math.round(c));
   return eot;
}

'Returns the density in km/s.
'p_m = planet mass in EU
'p_r = planet radius in EU
Public Sub PlanetDensity(p_m As Double, p_r As Double) As Double
    Dim vol As Double
    p_m = mass_earth * p_m
    p_r = radius_earth * p_r
    vol = (4 / 3) * cPI * Power(p_r,3)
    Return p_m / vol / Power(10,12)
End Sub

/**
 * Returns the overall density in gr / cubic centimeter.
 * @param pMass planet mass in Earth units.
 * @param pRadius planet radius in Earth units.
 * @return Density
 */
public double PlanetDensity(double pMass, double pRadius) {
   pMass = CONST_MASS_EARTH_KG * pMass;
   pRadius = CONST_RADIUS_EARTH * pRadius;
   double vol = (4 / 3) * Math.PI * Math.pow(pRadius,3);
   return (pMass / vol) / Math.pow(10,12);
}