|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
public interface AstroConstants
Definitions of useful global constants related to astronomical calculations.
Field Summary | |
---|---|
static double |
ABERRATION
The constant of aberration, κ. |
static double |
AU
One AU, in km. |
static double |
HALFPI
Half pi; a quarter circle in radians; same as 90 degrees. |
static double |
J1900
The Julian date of the 1900 Jan 0.5 epoch (which is actually noon, 31 Dec 1989) relative to the astronomical epoch of 4713 BC. |
static double |
J1990
The Julian date of the 1990 Jan 0.0 epoch (which is actually 31 Dec 1989) relative to the astronomical epoch of 4713 BC. |
static double |
J2000
The Julian date of the 2000 Jan 1.5 epoch (which is actually 1 Jan 2000 at noon) relative to the astronomical epoch of 4713 BC. |
static double |
JD_UNIX
The Julian date of the Unix/Java 1970 Jan 1.0 epoch relative to the astronomical epoch of 4713 BC. |
static double |
REFRACTION
The vertical displacement of an object due to atmospheric refraction -- 24 arcmins. |
static double |
SECS_PER_DAY
The number of seconds in a day. |
static double |
SIDEREAL_RATIO
The length of the sidereal year in mean solar days. |
static double |
SIDEREAL_YEAR
The length of the sidereal year in mean solar days. |
static double |
TROPICAL_YEAR
The length of the tropical year in mean solar days. |
static double |
TWILIGHT
The angle of the Sun below the horizon at the start / end of twilight, in radians. |
static double |
TWOPI
Two times pi; a circle in radians; same as 360 degrees. |
static double |
ε_2000
The obliquity of the ecliptic (angle between the ecliptic and the equator) at epoch 2000 Jan 1.5, in radians. |
Field Detail |
---|
static final double HALFPI
static final double TWOPI
static final double SECS_PER_DAY
static final double JD_UNIX
static final double J1900
static final double J1990
static final double J2000
static final double ε_2000
static final double SIDEREAL_RATIO
static final double SIDEREAL_YEAR
static final double TROPICAL_YEAR
static final double REFRACTION
static final double ABERRATION
static final double TWILIGHT
static final double AU
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |