Astronomy (Docs - TinyWeatherForecastGermany - Tiny Weather Forecast Germany)

java.lang.Object
- org.astronomie.info.Astronomy

public class Astronomy
extends java.lang.Object

Astronomical Calculations

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`Astronomy.Coor`	set of variables for sun calculations
`static class`	`Astronomy.Riseset`	set of variables for sunrise calculations
`static class`	`Astronomy.Time`	time calculations

Constructor Summary

Constructors
Constructor Description

Astronomy()

Constructors
Constructor	Description
`Astronomy()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static double`	`calcJD(int day, int month, int year)`
`static Astronomy.Coor`	`ecl2Equ(Astronomy.Coor coor, double TDT)`	Transform ecliptical coordinates (lon/lat) to equatorial coordinates (RA/dec)
`static Astronomy.Coor`	`equ2Altaz(Astronomy.Coor coor, double TDT, double geolat, double lmst)`	Transform equatorial coordinates (RA/Dec) to horizonal coordinates (azimuth/altitude) Refraction is ignored
`static Astronomy.Coor`	`equPolar2Cart(double lon, double lat, double distance)`	Calculate cartesian from polar coordinates
`static double`	`frac(double x)`
`static Astronomy.Coor`	`geoEqu2TopoEqu(Astronomy.Coor coor, Astronomy.Coor observer, double lmst)`	Transform geocentric equatorial coordinates (RA/Dec) to topocentric equatorial coordinates
`static double`	`gMST(double JD)`
`static double`	`gMST2LMST(double gmst, double lon)`
`static double`	`gMST2UT(double JD, double gmst)`
`static int`	`Int(double x)`
`static double`	`mod(double a, double b)`
`static double`	`mod2Pi(double x)`
`static Astronomy.Coor`	`moonPosition(Astronomy.Coor sunCoor, double TDT)`	Calculate data and coordinates for the Moon Coordinates are accurate to about 1/5 degree (in ecliptic coordinates)
`static Astronomy.Coor`	`moonPosition(Astronomy.Coor sunCoor, double TDT, Astronomy.Coor observer, double lmst)`
`static Astronomy.Riseset`	`moonRise(double JD, double deltaT, double lon, double lat, double zone, boolean recursive)`	Find local time of moonrise and moonset JD is the Julian Date of 0h local time (midnight) Accurate to about 5 minutes or better recursive: 1 - calculate rise/set in UTC recursive: 0 - find rise/set on the current local day (set could also be first) returns 0.000000000 for moonrise/set does not occur on selected day
`static Astronomy.Coor`	`observer2EquCart(double lon, double lat, double height, double gmst)`	Calculate observers cartesian equatorial coordinates (x,y,z in celestial frame) from geodetic coordinates (longitude, latitude, height above WGS84 ellipsoid) Currently only used to calculate distance of a body from the observer
`static double`	`refraction(double alt)`	Rough refraction formula using standard atmosphere: 1015 mbar and 10°C Input true altitude in radians, Output: increase in altitude in degrees
`static double`	`round10(double x)`
`static double`	`round100(double x)`
`static double`	`round1000(double x)`
`static double`	`round10000(double x)`
`static double`	`round100000(double x)`
`static double`	`round1000000(double x)`
`static java.lang.String`	`sign(double lon)`
`static double`	`sqr(double x)`
`static Astronomy.Coor`	`sunPosition(double TDT)`	Calculate coordinates for Sun Coordinates are accurate to about 10s (right ascension) and a few minutes of arc (declination)
`static Astronomy.Coor`	`sunPosition(double TDT, double geolat, double lmst)`
`static Astronomy.Riseset`	`sunRise(double JD, double deltaT, double lon, double lat, double zone, boolean recursive)`	Find (local) time of sunrise and sunset, and twilights JD is the Julian Date of 0h local time (midnight) Accurate to about 1-2 minutes recursive: 1 - calculate rise/set in UTC in a second run recursive: 0 - find rise/set on the current local day.
`static java.lang.String`	`timeHHMM(double hh)`
`static java.lang.String`	`timeHHMMdec(double hh)`
`static java.lang.String`	`timeHHMMSS(double hh)`
`static java.lang.String`	`timeHHMMSSdec(double hh)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Astronomy
```
public Astronomy()
```

Method Detail

Int
```
public static int Int(double x)
```

sqr

public static double sqr(double x)

frac

public static double frac(double x)

mod

public static double mod(double a,
                         double b)

mod2Pi

public static double mod2Pi(double x)

round1000000

public static double round1000000(double x)

round100000

public static double round100000(double x)

round10000

public static double round10000(double x)

round1000

public static double round1000(double x)

round100

public static double round100(double x)

round10

public static double round10(double x)

timeHHMMSS
```
public static java.lang.String timeHHMMSS(double hh)
```
Parameters:

hh - Decimal Time

Returns:

a String of decimal Time HH:MM:SS

timeHHMMSSdec
```
public static java.lang.String timeHHMMSSdec(double hh)
```
Parameters:

hh - Decimal Time

Returns:

a String of decimal Time HH:MM:SS = Decimal Time

timeHHMMdec
```
public static java.lang.String timeHHMMdec(double hh)
```
Parameters:

hh - Decimal Time

Returns:

a String of decimal Time HH:MM = Decimal Time

timeHHMM
```
public static java.lang.String timeHHMM(double hh)
```
Parameters:

hh - Decimal Time

Returns:

a String of decimal Time HH:MM

sign
```
public static java.lang.String sign(double lon)
```
Parameters:

lon - geographical longitude in degree

Returns:

the name String of a sign

calcJD

public static double calcJD(int day,
                            int month,
                            int year)

Parameters:: day -; month -; year -
Returns:: Julian date: valid only from 1.3.1901 to 28.2.2100

gMST
```
public static double gMST(double JD)
```
Parameters:

JD - Julian Date

Returns:

Julian Date converted to Greenwich Mean Sidereal Time

gMST2UT
```
public static double gMST2UT(double JD,
                             double gmst)
```
Parameters:

JD - Julian Date

gmst - Greenwich mean sidereal

Returns:

convert Greenweek mean sidereal time to UT

gMST2LMST
```
public static double gMST2LMST(double gmst,
                               double lon)
```
Parameters:

gmst - Greenwich mean sidereal

lon - geographical longitude in radians, East is positive

Returns:

Local Mean Sidereal Time

ecl2Equ
```
public static Astronomy.Coor ecl2Equ(Astronomy.Coor coor,
                                     double TDT)
```
Transform ecliptical coordinates (lon/lat) to equatorial coordinates (RA/dec)

Parameters:

coor -

TDT -

Returns:

equatorial coordinate (RA/dec)

equ2Altaz

public static Astronomy.Coor equ2Altaz(Astronomy.Coor coor,
                                       double TDT,
                                       double geolat,
                                       double lmst)

Transform equatorial coordinates (RA/Dec) to horizonal coordinates (azimuth/altitude) Refraction is ignored

Parameters:: coor -; TDT -; geolat -; lmst -
Returns:: horizonal coordinates (azimuth/altitude)

geoEqu2TopoEqu

public static Astronomy.Coor geoEqu2TopoEqu(Astronomy.Coor coor,
                                            Astronomy.Coor observer,
                                            double lmst)

Transform geocentric equatorial coordinates (RA/Dec) to topocentric equatorial coordinates

Parameters:: coor -; observer -; lmst -
Returns:: topocentric equatorial coordinates

equPolar2Cart

public static Astronomy.Coor equPolar2Cart(double lon,
                                           double lat,
                                           double distance)

Calculate cartesian from polar coordinates

Parameters:: lon -; lat -; distance -
Returns:: cartesian

observer2EquCart
```
public static Astronomy.Coor observer2EquCart(double lon,
                                              double lat,
                                              double height,
                                              double gmst)
```
Calculate observers cartesian equatorial coordinates (x,y,z in celestial frame) from geodetic coordinates (longitude, latitude, height above WGS84 ellipsoid) Currently only used to calculate distance of a body from the observer

Parameters:

lon -

lat -

height -

gmst -

Returns:

observers cartesian equatorial coordinates

sunPosition
```
public static Astronomy.Coor sunPosition(double TDT)
```
Calculate coordinates for Sun Coordinates are accurate to about 10s (right ascension) and a few minutes of arc (declination)

Parameters:

TDT -

Returns:

coordinates for Sun

sunPosition

public static Astronomy.Coor sunPosition(double TDT,
                                         double geolat,
                                         double lmst)

Parameters:: TDT -; geolat -; lmst -
Returns:: coordinates for Sun

moonPosition
```
public static Astronomy.Coor moonPosition(Astronomy.Coor sunCoor,
                                          double TDT)
```
Calculate data and coordinates for the Moon Coordinates are accurate to about 1/5 degree (in ecliptic coordinates)

Parameters:

sunCoor -

TDT -

Returns:

data and coordinates for the Moon

moonPosition

public static Astronomy.Coor moonPosition(Astronomy.Coor sunCoor,
                                          double TDT,
                                          Astronomy.Coor observer,
                                          double lmst)

Parameters:: sunCoor -; TDT -; observer -; lmst -
Returns:: data and coordinates for the Moon

refraction
```
public static double refraction(double alt)
```
Rough refraction formula using standard atmosphere: 1015 mbar and 10°C Input true altitude in radians, Output: increase in altitude in degrees

Parameters:

alt -

Returns:

increase in altitude in degrees

sunRise
```
public static Astronomy.Riseset sunRise(double JD,
                                        double deltaT,
                                        double lon,
                                        double lat,
                                        double zone,
                                        boolean recursive)
```
Find (local) time of sunrise and sunset, and twilights JD is the Julian Date of 0h local time (midnight) Accurate to about 1-2 minutes recursive: 1 - calculate rise/set in UTC in a second run recursive: 0 - find rise/set on the current local day. This is set when doing the first call to this function

Parameters:

JD -

deltaT -

lon -

lat -

zone -

recursive -

Returns:

(local) time of sunrise and sunset, and twilights

moonRise
```
public static Astronomy.Riseset moonRise(double JD,
                                         double deltaT,
                                         double lon,
                                         double lat,
                                         double zone,
                                         boolean recursive)
```
Find local time of moonrise and moonset JD is the Julian Date of 0h local time (midnight) Accurate to about 5 minutes or better recursive: 1 - calculate rise/set in UTC recursive: 0 - find rise/set on the current local day (set could also be first) returns 0.000000000 for moonrise/set does not occur on selected day

Parameters:

JD -

deltaT -

lon -

lat -

zone -

recursive -

Returns:

local time of moonrise and moonset

Class Astronomy

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Astronomy

Method Detail

Int

sqr

frac

mod

mod2Pi

round1000000

round100000

round10000

round1000

round100

round10

timeHHMMSS

timeHHMMSSdec

timeHHMMdec

timeHHMM

sign

calcJD

gMST

gMST2UT

gMST2LMST

ecl2Equ

equ2Altaz

geoEqu2TopoEqu

equPolar2Cart

observer2EquCart

sunPosition

sunPosition

moonPosition

moonPosition

refraction

sunRise

moonRise