driver.ted.astro
Class T_LunarCoords

java.lang.Object
  driver.ted.astro.T_LunarCoords

All Implemented Interfaces:

java.io.Serializable

public class T_LunarCoords
extends java.lang.Object
implements java.io.Serializable

Title: T_LunarCoords Description: This file implements the T_LunarCoords class Copyright: (c) 2002 - 2006

Version:

1.3 Change from version 1.2: Now determine k differently...use the full jd instead of defining mid points for a given month. Change from version 1.1: Added code to determine the moon phase dates for new, first quarter, full and last quarter

Author:

Ted Driver

See Also:

Serialized Form

Field Summary

static int	FIRST_QUARTER First Quarter identifier
static int	FULL_MOON Full moon identifier
static int	LAST_QUARTER Last quarter identifier
static int	NEW_MOON New Moon identifier

Constructor Summary

T_LunarCoords()
Constructor: initializes with current system time

T_LunarCoords(T_JulianDate J)
Constructor: initializes with time defined by T_JulianDate object

Method Summary

double	getAlpha() Returns the apparent Right Ascension of the moon at the given time
double	getDelta() Return the apparent Declination
double	getEquatorialParallax() Returns the Moon's equatorial Parallax in Radians
double	getIllumination(T_JulianDate J) Public function to return a value between 0 and 1 representing the percent of the lit moon's face facing Earth.
double	getPhase(T_JulianDate today, double offset, int phaseType) Returns the time of the specified phase, including the specified time offset
static void	main(java.lang.String[] args) Test program
void	setDateTime(T_JulianDate J) Sets the date and time for this object

Methods inherited from class java.lang.Object

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

Field Detail

NEW_MOON

public static final int NEW_MOON

New Moon identifier

See Also:

Constant Field Values

FIRST_QUARTER

public static final int FIRST_QUARTER

First Quarter identifier

See Also:

Constant Field Values

FULL_MOON

public static final int FULL_MOON

Full moon identifier

See Also:

Constant Field Values

LAST_QUARTER

public static final int LAST_QUARTER

Last quarter identifier

See Also:

Constant Field Values

Constructor Detail

T_LunarCoords

public T_LunarCoords()

Constructor: initializes with current system time

T_LunarCoords

public T_LunarCoords(T_JulianDate J)

Constructor: initializes with time defined by T_JulianDate object

Parameters:

J - The T_JulianDate object defining the time

Method Detail

setDateTime

public void setDateTime(T_JulianDate J)

Sets the date and time for this object

Parameters:

J - T_JulianDate object defining the new time.

getIllumination

public double getIllumination(T_JulianDate J)

Public function to return a value between 0 and 1 representing the percent of the lit moon's face facing Earth. The value 0 represents a new Moon, or 0% lit, and 1 represents a Full Moon or 100% lit.

Parameters:

J - The T_JulianDate to use for the calculation

Returns:

A double value between 0 and 1

main

public static void main(java.lang.String[] args)

Test program

Parameters:

args - args

getAlpha

public double getAlpha()

Returns the apparent Right Ascension of the moon at the given time

Returns:

Apparent Right Ascension

getDelta

public double getDelta()

Return the apparent Declination

Returns:

Apparent Declination

getEquatorialParallax

public double getEquatorialParallax()

Returns the Moon's equatorial Parallax in Radians

Returns:

equatorial parallax (radians)

getPhase

public double getPhase(T_JulianDate today,
                       double offset,
                       int phaseType)

Returns the time of the specified phase, including the specified time offset

Parameters:

today - The T_JulianDate object specifying the time

offset - The time offset in hours

phaseType - The type of phase requested - use one of the predefined objects in the class.

Returns:

Returns the Julian Date of the specified phase