org.jscience.astronomy
Class AstronomyConstants

java.lang.Object
  extended by 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.

See Also:
Constant Field Values

LIGHT_YEAR

public static final double LIGHT_YEAR
Length of a (Julian) light year (defined), in meters.

See Also:
Constant Field Values

EARTH_YEAR

public static final double EARTH_YEAR
A earth year in days.

See Also:
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).

See Also:
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.

See Also:
Constant Field Values

SIDERAL_DAY

public static final double SIDERAL_DAY
Length of sideral day in seconds.

See Also:
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.

See Also:
Constant Field Values

EARTH_DAY

public static final double EARTH_DAY
Length of day in seconds.

See Also:
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.

See Also:
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()