Class Astronomy

Method Details

• 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 String timeHHMMSS(double hh)

  Parameters:

  hh - Decimal Time

  Returns:

  a String of decimal Time HH:MM:SS

• timeHHMMSSdec

  public static String timeHHMMSSdec(double hh)

  Parameters:

  hh - Decimal Time

  Returns:

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

• timeHHMMdec

  public static String timeHHMMdec(double hh)

  Parameters:

  hh - Decimal Time

  Returns:

  a String of decimal Time HH:MM = Decimal Time

• timeHHMM

  public static String timeHHMM(double hh)

  Parameters:

  hh - Decimal Time

  Returns:

  a String of decimal Time HH:MM

• sign

  public static 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