Class CoordsDegrees


  • public class CoordsDegrees
    extends java.lang.Object
    Functions for angle transformations and manipulations, with angles generally in degrees. In particular, methods for translating between degrees and HH:MM:SS.S or DDD:MM:SS.S type sexagesimal representations are provided.
    Since:
    11 Oct 2011
    Author:
    Mark Taylor
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String degreesToDms​(double deg)
      Converts an angle in degrees to a formatted degrees:minutes:seconds string.
      static java.lang.String degreesToDms​(double deg, int secFig)
      Converts an angle in degrees to a formatted degrees:minutes:seconds string with a given number of decimal places in the seconds field.
      static java.lang.String degreesToHms​(double deg)
      Converts an angle in degrees to a formatted hours:minutes:seconds string.
      static java.lang.String degreesToHms​(double deg, int secFig)
      Converts an angle in degrees to a formatted hours:minutes:seconds string with a given number of decimal places in the seconds field.
      static double dmsToDegrees​(double deg, double min, double sec)
      Converts degrees, minutes, seconds to an angle in degrees.
      static double dmsToDegrees​(java.lang.String dms)
      Converts a formatted degrees:minutes:seconds string to an angle in degrees.
      static double hmsToDegrees​(double hour, double min, double sec)
      Converts hours, minutes, seconds to an angle in degrees.
      static double hmsToDegrees​(java.lang.String hms)
      Converts a formatted hours:minutes:seconds string to an angle in degrees.
      static double polarDistanceDegrees​(double ra1, double dec1, double radius1, double ra2, double dec2, double radius2)
      Calculates the distance in three dimensional space between two points specified in spherical polar coordinates.
      static double posAngDegrees​(double ra1, double dec1, double ra2, double dec2)
      Calculates the position angle between two points on the sky in degrees.
      static double skyDistanceDegrees​(double ra1, double dec1, double ra2, double dec2)
      Calculates the separation (distance around a great circle) of two points on the sky in degrees.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Method Detail

      • degreesToDms

        public static java.lang.String degreesToDms​(double deg)
        Converts an angle in degrees to a formatted degrees:minutes:seconds string. No fractional part of the seconds field is given.
        Parameters:
        deg - angle in degrees
        Returns:
        DMS-format string representing deg
      • degreesToDms

        public static java.lang.String degreesToDms​(double deg,
                                                    int secFig)
        Converts an angle in degrees to a formatted degrees:minutes:seconds string with a given number of decimal places in the seconds field.
        Parameters:
        deg - angle in degrees
        secFig - number of decimal places in the seconds field
        Returns:
        DMS-format string representing deg
      • degreesToHms

        public static java.lang.String degreesToHms​(double deg)
        Converts an angle in degrees to a formatted hours:minutes:seconds string. No fractional part of the seconds field is given.
        Parameters:
        deg - angle in degrees
        Returns:
        HMS-format string representing deg
      • degreesToHms

        public static java.lang.String degreesToHms​(double deg,
                                                    int secFig)
        Converts an angle in degrees to a formatted hours:minutes:seconds string with a given number of decimal places in the seconds field.
        Parameters:
        deg - angle in degrees
        secFig - number of decimal places in the seconds field
        Returns:
        HMS-format string representing deg
      • dmsToDegrees

        public static double dmsToDegrees​(java.lang.String dms)
        Converts a formatted degrees:minutes:seconds string to an angle in degrees. Delimiters may be colon, space, characters dm[s], or some others. Additional spaces and leading +/- are permitted. The :seconds part is optional.
        Parameters:
        dms - formatted DMS string
        Returns:
        angle in degrees specified by dms
        Throws:
        java.lang.NumberFormatException - if dms can't be parsed as a degrees:minutes:seconds string
      • hmsToDegrees

        public static double hmsToDegrees​(java.lang.String hms)
        Converts a formatted hours:minutes:seconds string to an angle in degrees. Delimiters may be colon, space, characters hm[s], or some others. Additional spaces and leading +/- are permitted. The :seconds part is optional.
        Parameters:
        hms - formatted HMS string
        Returns:
        angle in degrees specified by hms
        Throws:
        java.lang.NumberFormatException - if dms can't be parsed as an hours:minutes:seconds string
      • dmsToDegrees

        public static double dmsToDegrees​(double deg,
                                          double min,
                                          double sec)
        Converts degrees, minutes, seconds to an angle in degrees.

        In conversions of this type, one has to be careful to get the sign right in converting angles which are between 0 and -1 degrees. This routine uses the sign bit of the deg argument, taking care to distinguish between +0 and -0 (their internal representations are different for floating point values). It is illegal for the min or sec arguments to be negative.

        Parameters:
        deg - degrees part of angle
        min - minutes part of angle
        sec - seconds part of angle
        Returns:
        specified angle in degrees
        Throws:
        java.lang.IllegalArgumentException - if an argument after the first non-zero one is negative
      • hmsToDegrees

        public static double hmsToDegrees​(double hour,
                                          double min,
                                          double sec)
        Converts hours, minutes, seconds to an angle in degrees.

        In conversions of this type, one has to be careful to get the sign right in converting angles which are between 0 and -1 hours. This routine uses the sign bit of the hour argument, taking care to distinguish between +0 and -0 (their internal representations are different for floating point values).

        Parameters:
        hour - degrees part of angle
        min - minutes part of angle
        sec - seconds part of angle
        Returns:
        specified angle in degrees
        Throws:
        java.lang.IllegalArgumentException - if an argument after the first non-zero one is negative
      • skyDistanceDegrees

        public static double skyDistanceDegrees​(double ra1,
                                                double dec1,
                                                double ra2,
                                                double dec2)
        Calculates the separation (distance around a great circle) of two points on the sky in degrees.
        Parameters:
        ra1 - right ascension of point 1 in degrees
        dec1 - declination of point 1 in degrees
        ra2 - right ascension of point 2 in degrees
        dec2 - declination of point 2 in degrees
        Returns:
        angular distance between point 1 and point 2 in degrees
      • posAngDegrees

        public static double posAngDegrees​(double ra1,
                                           double dec1,
                                           double ra2,
                                           double dec2)
        Calculates the position angle between two points on the sky in degrees. The result is in the range +/-180. If point 2 is due east of point 1, the result is +90. Zero is returned if the points are coincident.
        Parameters:
        ra1 - right ascension of point 1 in degrees
        dec1 - declination of point 1 in degrees
        ra2 - right ascension of point 2 in degrees
        dec2 - declination of point 2 in degrees
        Returns:
        bearing in degrees of point 2 from point 1.
      • polarDistanceDegrees

        public static double polarDistanceDegrees​(double ra1,
                                                  double dec1,
                                                  double radius1,
                                                  double ra2,
                                                  double dec2,
                                                  double radius2)
        Calculates the distance in three dimensional space between two points specified in spherical polar coordinates.
        Parameters:
        ra1 - right ascension of point 1 in degrees
        dec1 - declination of point1 in degrees
        radius1 - distance from origin of point1
        ra2 - right ascension of point 2 in degrees
        dec2 - declination of point2 in degrees
        radius2 - distance from origin of point2
        Returns:
        the linear distance between point1 and point2; units are as for radius1 and radius2