org.jastronomy.jsofa

Class JSOFA.JulianDate

java.lang.Object

org.jastronomy.jsofa.JSOFA.JulianDate

Enclosing class:

JSOFA

public static class JSOFA.JulianDate
extends Object

Julian Date representation. The actual date is djm0+djm1, apportioned in any convenient way between the two arguments. For example, JD(TT)=2450123.7 could be expressed in any of these ways, among others:

            djm0          djm1

         2450123.7           0.0       (JD method)
         2451545.0       -1421.3       (J2000 method)
         2400000.5       50123.2       (MJD method)
         2450123.5           0.2       (date &time method)

The JD method is the most natural and convenient to use in cases where the loss of several decimal digits of resolution is acceptable. The J2000 method is best matched to the way the argument is handled internally and will deliver the optimum resolution. The MJD method and the date &time methods are both good compromises between resolution and convenience.

Author:

Paul Harrison (paul.harrison@manchester.ac.uk) 28 Jan 2010

Field Summary

Fields

Modifier and Type	Field and Description
double	djm0 MJD zero-point
double	djm1 MJD offset

Constructor Summary

Constructors

Constructor and Description
JulianDate(double d1, double d2)

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

djm0

public double djm0

MJD zero-point

djm1

public double djm1

MJD offset

Constructor Detail

JulianDate

public JulianDate(double d1,
                  double d2)