utility
Class SunAndMoon

java.lang.Object
  utility.SunAndMoon

public class SunAndMoon
extends java.lang.Object

All this stuff is stolen (ported) from skycalc

Field Summary

static double	ARCSEC_IN_RADIAN
static double	DEG_IN_RADIAN
static java.text.DateFormat	df
static double	EIGHTH_OF_MONTH
static double	HRS_IN_RADIAN
static double	J2000
static double	PERIOD
static double	PI
static double	SEC_IN_DAY
static double	tzone

Constructor Summary

SunAndMoon()

Method Summary

static void	aa2hd(java.util.Hashtable hash) converts alt-az (deg,deg) to ha-dec (hr,deg).
static double	acos(double x)
static double	adj_time(double x) adjusts a time (decimal hours) to be between -12 and 12, generally used for hour angles.
static double	altit(double dec, double ha, double lat) returns altitude(deg) for dec, ha, lat (dd dec, lat, deg; dh hr)
static double	asin(double x)
static double	atan_circ(double x, double y) returns radian angle 0 to 2pi for coords x, y -- get that quadrant right !!
static double	atan(double x)
static double	atan(double x, double y)
static double	azimuth(double dec, double ha, double lat) returns azimuth(deg) for dec, ha, lat (dd dec, lat, deg; dh hr)
static double	cos(double x)
static double	fabs(double x)
static double	getDateOfAltRise(double alt, double jd, double ra, double dec, double lat, double longit) get the time when an object is rising at a given altitude
static double	getDateOfAltRiseSet(double alt, double jd, double ra, double dec, double lat, double longit, boolean doRise) get the time when an object is rising or setting at a given altitude
static double	getDateOfAltSet(double alt, double jd, double ra, double dec, double lat, double longit) get the time when an object is setting at a given altitude
static double	getEpheremis(double jd, double dlat, double hlongit, double elev, boolean doSun, boolean doRise) gets the rise or set time for the sun or moon on a given day and location
static double	getMoonDEC(double jd, double dlat, double hlongit)
static double	getMoonRA(double jd, double dlat, double hlongit)
static double	getMoonRise(double jd, double dlat, double hlongit, double elev)
static double	getMoonSet(double jd, double dlat, double hlongit, double elev)
static double	getRiseTime(double jd, double ra, double dec, double lat, double longit) Get the rise time of an object given an RA and DEC.
static double	getSetTime(double jd, double ra, double dec, double lat, double longit) Get the set time of an object given an RA and DEC.
static double	getSunDEC(double jd)
static double	getSunRA(double jd)
static double	getSunRise(double jd, double dlat, double hlongit, double elev)
static double	getSunSet(double jd, double dlat, double hlongit, double elev)
static double	ha_alt(double dec, double lat, double alt) returns hour angle at which object at dec is at altitude alt.
static double	jd_alt(double alt, double jdguess, double lat, double longit, boolean doSun) returns jd at which sun or moon is at a given altitude, given jdguess as a starting point.
static double	julDateOfAlt(double alt, double jdguess, double lat, double longit, double ra, double dec) returns jd at which object is at a given altitude, given jdguess as a starting point.
static void	lpmoon(double jd, double lat, double sid, PointersSuck ps) ps holds ra, dec, and dist of moon.
static void	lpsun(double jd, PointersSuck ps) Low precision formulae for the sun, from Almanac p.
static double	lst(double jd, double longit) returns the local MEAN sidereal time (dec hrs) at julian date jd at west longitude long (decimal hours).
static void	main(java.lang.String[] args) provides command line access to the routines
static void	min_max_alt(double lat, double dec, PointersSuck ps) computes minimum and maximum altitude for a given dec and latitude.
static double	sin(double x)
static double	sqrt(double x)

Methods inherited from class java.lang.Object

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

Field Detail

EIGHTH_OF_MONTH

public static final double EIGHTH_OF_MONTH

See Also:

Constant Field Values

PERIOD

public static final double PERIOD

See Also:

Constant Field Values

PI

public static final double PI

See Also:

Constant Field Values

ARCSEC_IN_RADIAN

public static final double ARCSEC_IN_RADIAN

See Also:

Constant Field Values

DEG_IN_RADIAN

public static final double DEG_IN_RADIAN

See Also:

Constant Field Values

HRS_IN_RADIAN

public static final double HRS_IN_RADIAN

See Also:

Constant Field Values

J2000

public static final double J2000

See Also:

Constant Field Values

SEC_IN_DAY

public static final double SEC_IN_DAY

See Also:

Constant Field Values

tzone

public static double tzone

df

public static java.text.DateFormat df

Constructor Detail

SunAndMoon

public SunAndMoon()

Method Detail

main

public static void main(java.lang.String[] args)

provides command line access to the routines

lst

public static double lst(double jd,
                         double longit)

returns the local MEAN sidereal time (dec hrs) at julian date jd at west longitude long (decimal hours). Follows definitions in 1992 Astronomical Almanac, pp. B7 and L2. Expression for GMST at 0h ut referenced to Aoki et al, A&A 105, p.359, 1982. On workstations, accuracy (numerical only!) is about a millisecond in the 1990s.

lpmoon

public static void lpmoon(double jd,
                          double lat,
                          double sid,
                          PointersSuck ps)

ps holds ra, dec, and dist of moon.

implements "low precision" moon algorithms from Astronomical Almanac (p. D46 in 1992 version). Does apply the topocentric correction. Units are as follows jd,lat, sid; decimal hours ra, *dec, decimal hours, degrees dist; earth radii

ha_alt

public static double ha_alt(double dec,
                            double lat,
                            double alt)

returns hour angle at which object at dec is at altitude alt. If object is never at this altitude, signals with special return values 1000 (always higher) and -1000 (always lower).

min_max_alt

public static void min_max_alt(double lat,
                               double dec,
                               PointersSuck ps)

computes minimum and maximum altitude for a given dec and latitude.

adj_time

public static double adj_time(double x)

adjusts a time (decimal hours) to be between -12 and 12, generally used for hour angles.

altit

public static double altit(double dec,
                           double ha,
                           double lat)

returns altitude(deg) for dec, ha, lat (dd dec, lat, deg; dh hr)

azimuth

public static double azimuth(double dec,
                             double ha,
                             double lat)

returns azimuth(deg) for dec, ha, lat (dd dec, lat, deg; dh hr)

aa2hd

public static void aa2hd(java.util.Hashtable hash)

converts alt-az (deg,deg) to ha-dec (hr,deg). Put "altitude", "azimuth", and "latitude" entries into the Hashtable (all as Doubles in deg). Out put is "declination" and "hourAngle" in the hash (deg and hr as Double).

lpsun

public static void lpsun(double jd,
                         PointersSuck ps)

Low precision formulae for the sun, from Almanac p. C24 (1990) ra and dec are returned as decimal hours and decimal degrees.

jd_alt

public static double jd_alt(double alt,
                            double jdguess,
                            double lat,
                            double longit,
                            boolean doSun)

returns jd at which sun or moon is at a given altitude, given jdguess as a starting point.

getEpheremis

public static double getEpheremis(double jd,
                                  double dlat,
                                  double hlongit,
                                  double elev,
                                  boolean doSun,
                                  boolean doRise)

gets the rise or set time for the sun or moon on a given day and location

getSunRise

public static double getSunRise(double jd,
                                double dlat,
                                double hlongit,
                                double elev)

getSunSet

public static double getSunSet(double jd,
                               double dlat,
                               double hlongit,
                               double elev)

getMoonRise

public static double getMoonRise(double jd,
                                 double dlat,
                                 double hlongit,
                                 double elev)

getMoonSet

public static double getMoonSet(double jd,
                                double dlat,
                                double hlongit,
                                double elev)

getSunRA

public static double getSunRA(double jd)

getSunDEC

public static double getSunDEC(double jd)

getMoonRA

public static double getMoonRA(double jd,
                               double dlat,
                               double hlongit)

getMoonDEC

public static double getMoonDEC(double jd,
                                double dlat,
                                double hlongit)

julDateOfAlt

public static double julDateOfAlt(double alt,
                                  double jdguess,
                                  double lat,
                                  double longit,
                                  double ra,
                                  double dec)

returns jd at which object is at a given altitude, given jdguess as a starting point.

getRiseTime

public static double getRiseTime(double jd,
                                 double ra,
                                 double dec,
                                 double lat,
                                 double longit)

Get the rise time of an object given an RA and DEC.

getDateOfAltRise

public static double getDateOfAltRise(double alt,
                                      double jd,
                                      double ra,
                                      double dec,
                                      double lat,
                                      double longit)

get the time when an object is rising at a given altitude

getSetTime

public static double getSetTime(double jd,
                                double ra,
                                double dec,
                                double lat,
                                double longit)

Get the set time of an object given an RA and DEC.

getDateOfAltSet

public static double getDateOfAltSet(double alt,
                                     double jd,
                                     double ra,
                                     double dec,
                                     double lat,
                                     double longit)

get the time when an object is setting at a given altitude

getDateOfAltRiseSet

public static double getDateOfAltRiseSet(double alt,
                                         double jd,
                                         double ra,
                                         double dec,
                                         double lat,
                                         double longit,
                                         boolean doRise)

get the time when an object is rising or setting at a given altitude

sin

public static double sin(double x)

cos

public static double cos(double x)

asin

public static double asin(double x)

acos

public static double acos(double x)

atan

public static double atan(double x)

atan

public static double atan(double x,
                          double y)

fabs

public static double fabs(double x)

sqrt

public static double sqrt(double x)

atan_circ

public static double atan_circ(double x,
                               double y)

returns radian angle 0 to 2pi for coords x, y -- get that quadrant right !!