astro
Class SimpleSid

java.lang.Object
  astro.SimpleSid

All Implemented Interfaces:

SiderealTiming, PI

public class SimpleSid
extends Object
implements SiderealTiming, PI

Class to calculate the sidereal time for a given location and Date. The algorithm is linear in time. Returned sid time is in radians!

Field Summary

protected static double[]

Const Constants for linear tranformation of solar time into sidereal time.

Fields inherited from interface astro.SiderealTiming

SOL_TO_SID

Fields inherited from interface vec_math.PI

HOUR, PIHALF, PITWO, RADIAN

Constructor Summary

SimpleSid()

Method Summary

double	getLocalSidereal(Site site, Date time) The implementation of the SiderealTime interface.
protected double	getSid(double jdfjd) Rather simple sidereal time calculater.
double	getSiderealGMT(Date time) The implementation of the SiderealTime interface.
static void	main(String[] arg) Prints the current sidereal time or the sidereal time of the given date.
String	toString() A simple string describing the algorithm.

Methods inherited from class java.lang.Object

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

Field Detail

Const

protected static double[] Const

Constants for linear tranformation of solar time into sidereal time.

Constructor Detail

SimpleSid

public SimpleSid()

Method Detail

getSid

protected double getSid(double jdfjd)

Rather simple sidereal time calculater. Uses a linear approximation in time.

Parameters:

jdfjd - The UTC time in julian date.

Returns:

The sidereal time in radians for Greenwich.

See Also:

SiderealTime

getSiderealGMT

public double getSiderealGMT(Date time)

The implementation of the SiderealTime interface. Converts the Date object into julian date using the Astro.JD(Date) method.

Specified by:

getSiderealGMT in interface SiderealTiming

Parameters:

time - The UTC-based time.

getLocalSidereal

public double getLocalSidereal(Site site,
                               Date time)

The implementation of the SiderealTime interface. Considers the longitude of the observer for calculating the sidereal time.

Specified by:

getLocalSidereal in interface SiderealTiming

Parameters:

site - The location of the observer.

time - The UTC-based time.

toString

public String toString()

A simple string describing the algorithm.

Overrides:

toString in class Object

Returns:

String

main

public static void main(String[] arg)

Prints the current sidereal time or the sidereal time of the given date.