net.e175.klaus.solarpositioning

Class JulianDate

java.lang.Object

net.e175.klaus.solarpositioning.JulianDate

public final class JulianDate
extends Object

Calculate Julian date for a given point in time. This follows the algorithm described in Reda, I.; Andreas, A. (2003): Solar Position Algorithm for Solar Radiation Applications. NREL Report No. TP-560-34302, Revised January 2008.

Author:

Klaus Brunner

Constructor Summary

Constructors

Constructor and Description
JulianDate(double fromJulianDate, double deltaT) Construct a Julian date from another.
JulianDate(GregorianCalendar date) Construct a Julian date, assuming deltaT to be 0.
JulianDate(GregorianCalendar date, double deltaT) Construct a Julian date, observing deltaT.

Method Summary

Modifier and Type	Method and Description
double	getJulianCentury()
double	getJulianDate()
double	getJulianEphemerisCentury()
double	getJulianEphemerisDay()
double	getJulianEphemerisMillennium()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

JulianDate

public JulianDate(GregorianCalendar date)

Construct a Julian date, assuming deltaT to be 0.

Parameters:

date -

JulianDate

public JulianDate(double fromJulianDate,
                  double deltaT)

Construct a Julian date from another.

JulianDate

public JulianDate(GregorianCalendar date,
                  double deltaT)

Construct a Julian date, observing deltaT.

Parameters:

date -

deltaT - Difference between earth rotation time and terrestrial time (or Universal Time and Terrestrial Time), in seconds. See http://asa.usno.navy.mil/SecK/DeltaT.html. For the year 2015, a reasonably accurate default would be 68.

Method Detail

getJulianDate

public double getJulianDate()

getJulianEphemerisDay

public double getJulianEphemerisDay()

getJulianCentury

public double getJulianCentury()

getJulianEphemerisCentury

public double getJulianEphemerisCentury()

getJulianEphemerisMillennium

public double getJulianEphemerisMillennium()

toString

public String toString()

Overrides:

toString in class Object