Class EphemerisCalculator

java.lang.Object

org.episteme.natural.physics.astronomy.mechanics.EphemerisCalculator

public class EphemerisCalculator
extends Object

Low-precision planetary ephemeris calculator.

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EphemerisCalculator.Planet	Solar system body declaration with orbital elements at J2000.

Constructor Summary

Constructors

Constructor	Description
EphemerisCalculator()

Method Summary

Modifier and Type	Method	Description
static double[]	geocentricPosition(EphemerisCalculator.Planet planet, JulianDate jd)	Calculates geocentric equatorial coordinates.
static double[]	heliocentricPosition(EphemerisCalculator.Planet planet, JulianDate jd)	Legacy support wrapper.
static Vector<Real>	heliocentricPositionVector(EphemerisCalculator.Planet planet, JulianDate jd)	Calculates heliocentric position vector (in J2000 ecliptic frame).
static double[]	moonPosition(JulianDate jd)	Calculates Moon position (low precision, ~1° accuracy).
static double[]	sunPosition(JulianDate jd)	Calculates Sun position in geocentric equatorial coordinates.

Methods inherited from class Object

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

Constructor Details

EphemerisCalculator

public EphemerisCalculator()

Method Details

heliocentricPositionVector

public static Vector<Real> heliocentricPositionVector(EphemerisCalculator.Planet planet,
 JulianDate jd)

Calculates heliocentric position vector (in J2000 ecliptic frame).

Parameters:

planet - Planet to calculate

jd - Julian Date

Returns:

Vector [x, y, z] in AU

heliocentricPosition

public static double[] heliocentricPosition(EphemerisCalculator.Planet planet,
 JulianDate jd)

Legacy support wrapper.

geocentricPosition

public static double[] geocentricPosition(EphemerisCalculator.Planet planet,
 JulianDate jd)

Calculates geocentric equatorial coordinates.

Parameters:

planet - Planet

jd - Julian Date

Returns:

[RA (hours), Dec (deg), distance (AU)]

sunPosition

public static double[] sunPosition(JulianDate jd)

Calculates Sun position in geocentric equatorial coordinates.

Parameters:

jd - Julian Date

Returns:

[RA (hours), Dec (deg)]

moonPosition

public static double[] moonPosition(JulianDate jd)

Calculates Moon position (low precision, ~1° accuracy).