org.jscience.astronomy
Class AstronomyConstants

java.lang.Object
  org.jscience.astronomy.AstronomyConstants

public final class AstronomyConstants
extends java.lang.Object

The AstronomyConstants class provides several useful constatnts for astronomy.

Field Summary

static double	AU Length of an Astronomical Unit, in meters.
static double	EARTH_DAY Length of day in seconds.
static double	EARTH_YEAR A earth year in days.
static double	GAUSSIAN_GRAVITATIONAL_CONSTANT Gaussian Gravitational Constant in A3/2S-1/2D-1 with length A: astronomical unit (the mean axis of the orbit of the Earth around the Sun); time D: mean solar day (the mean rotation period of the Earth around its axis, with respect to the Sun); mass S: the mass of the Sun.
static double	GAUSSIAN_YEAR Gaussian year in (earth) days (defined).
static double	HOUR Length of the standard hour in seconds.
static double	JULIAN_YEAR Length of a Julian year (defined) in (earth) days.
static double	LIGHT_YEAR Length of a (Julian) light year (defined), in meters.
static double	MINUTE Length of the standard minute in seconds (duration of 9,192,631,770 cycles of microwave light absorbed or emitted by the hyperfine transition of cesium-133 atoms in their ground state undisturbed by external fields).
static double	PARSEC Length of a parsec, in meters.
static double	SIDERAL_DAY Length of sideral day in seconds.
static double	SIDERAL_YEAR A earth sideral year in (earth) days (at the epoch J2000 = 1 Jan. 2000 12h Terrestrial Time).
static double	TROPICAL_YEAR A earth tropical year in (earth) days, or the period for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).

Constructor Summary

AstronomyConstants()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

AU

public static final double AU

Length of an Astronomical Unit, in meters.

See Also:

Constant Field Values

PARSEC

public static final double PARSEC

Length of a parsec, in meters.

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Constant Field Values

LIGHT_YEAR

public static final double LIGHT_YEAR

Length of a (Julian) light year (defined), in meters.

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Constant Field Values

EARTH_YEAR

public static final double EARTH_YEAR

A earth year in days.

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Constant Field Values

SIDERAL_YEAR

public static final double SIDERAL_YEAR

A earth sideral year in (earth) days (at the epoch J2000 = 1 Jan. 2000 12h Terrestrial Time).

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Constant Field Values

TROPICAL_YEAR

public static final double TROPICAL_YEAR

A earth tropical year in (earth) days, or the period for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).

See Also:

Constant Field Values

JULIAN_YEAR

public static final double JULIAN_YEAR

Length of a Julian year (defined) in (earth) days.

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Constant Field Values

SIDERAL_DAY

public static final double SIDERAL_DAY

Length of sideral day in seconds.

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Constant Field Values

MINUTE

public static final double MINUTE

Length of the standard minute in seconds (duration of 9,192,631,770 cycles of microwave light absorbed or emitted by the hyperfine transition of cesium-133 atoms in their ground state undisturbed by external fields).

See Also:

Constant Field Values

HOUR

public static final double HOUR

Length of the standard hour in seconds.

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Constant Field Values

EARTH_DAY

public static final double EARTH_DAY

Length of day in seconds.

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Constant Field Values

GAUSSIAN_GRAVITATIONAL_CONSTANT

public static final double GAUSSIAN_GRAVITATIONAL_CONSTANT

Gaussian Gravitational Constant in A3/2S-1/2D-1 with length A: astronomical unit (the mean axis of the orbit of the Earth around the Sun); time D: mean solar day (the mean rotation period of the Earth around its axis, with respect to the Sun); mass S: the mass of the Sun.

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Constant Field Values

GAUSSIAN_YEAR

public static final double GAUSSIAN_YEAR

Gaussian year in (earth) days (defined).

See Also:

Constant Field Values

Constructor Detail

AstronomyConstants

public AstronomyConstants()