fact.coordinates

Class EquatorialCoordinate

java.lang.Object

fact.coordinates.EquatorialCoordinate

All Implemented Interfaces:

CelestialCoordinate, Serializable

public class EquatorialCoordinate
extends Object
implements CelestialCoordinate

Created by maxnoe on 22.05.17.

Represents a celestial coordinate in the equatorial coordinate frame using right ascension and declination.

Provides a method to convert to the horizontal coordinate frame

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	declinationRad
static ZonedDateTime	j2000Reference
static double	precessionFactorM
static double	precessionFactorN
double	rightAscensionRad

Fields inherited from interface fact.coordinates.CelestialCoordinate

gstReferenceDateTime

Method Summary

Modifier and Type	Method and Description
static EquatorialCoordinate	fromDegrees(double rightAscensionDeg, double declinationDeg)
static EquatorialCoordinate	fromHourAngleAndDegrees(double rightAscensionHA, double declinationDeg)
static EquatorialCoordinate	fromHourAngleAndRad(double rightAscensionHA, double declinationRad)
static EquatorialCoordinate	fromRad(double rightAscensionRad, double declinationRad)
double	getDeclinationDeg()
double	getDeclinationRad()
double	getRightAscensionDeg()
double	getRightAscensionHA()
double	getRightAscensionRad()
double	greatCircleDistanceDeg(EquatorialCoordinate other)
double	greatCircleDistanceRad(EquatorialCoordinate other) Return the angular great circle distance in radians between this EquatorialCoordinate and another
HorizontalCoordinate	toHorizontal(ZonedDateTime observationTime, EarthLocation earthLocation) Transform this EquatorialCoordinate into the horizontal coordinate frame for given observation time and location.
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface fact.coordinates.CelestialCoordinate

datetimeToGST, greatCircleDistanceDeg, greatCircleDistanceRad

Field Detail

rightAscensionRad

public final double rightAscensionRad

declinationRad

public final double declinationRad

j2000Reference

public static final ZonedDateTime j2000Reference

precessionFactorM

public static final double precessionFactorM

See Also:

Constant Field Values

precessionFactorN

public static final double precessionFactorN

See Also:

Constant Field Values

Method Detail

fromRad

public static EquatorialCoordinate fromRad(double rightAscensionRad,
                                           double declinationRad)

fromDegrees

public static EquatorialCoordinate fromDegrees(double rightAscensionDeg,
                                               double declinationDeg)

fromHourAngleAndRad

public static EquatorialCoordinate fromHourAngleAndRad(double rightAscensionHA,
                                                       double declinationRad)

fromHourAngleAndDegrees

public static EquatorialCoordinate fromHourAngleAndDegrees(double rightAscensionHA,
                                                           double declinationDeg)

toHorizontal

public HorizontalCoordinate toHorizontal(ZonedDateTime observationTime,
                                         EarthLocation earthLocation)

Transform this EquatorialCoordinate into the horizontal coordinate frame for given observation time and location.

Implementation of the formulas from https://en.wikipedia.org/wiki/Celestial_coordinate_system#Equatorial_.E2.86.90.E2.86.92_horizontal

Parameters:

observationTime -

earthLocation -

Returns:

HorizontalCoordinate for given time and location;

toString

public String toString()

Overrides:

toString in class Object

greatCircleDistanceRad

public double greatCircleDistanceRad(EquatorialCoordinate other)

Return the angular great circle distance in radians between this EquatorialCoordinate and another

Parameters:

other -

Returns:

Angular great circle distance in radians

greatCircleDistanceDeg

public double greatCircleDistanceDeg(EquatorialCoordinate other)

getRightAscensionRad

public double getRightAscensionRad()

getDeclinationRad

public double getDeclinationRad()

getRightAscensionDeg

public double getRightAscensionDeg()

getRightAscensionHA

public double getRightAscensionHA()

getDeclinationDeg

public double getDeclinationDeg()