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### B.1.15 CoordsDegrees

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.

degreesToDms( deg )
  Converts an angle in degrees to a formatted degrees:minutes:seconds string. No fractional part of the seconds field is given.
degreesToDms( deg, secFig )
  Converts an angle in degrees to a formatted degrees:minutes:seconds string with a given number of decimal places in the seconds field.
degreesToHms( deg )
  Converts an angle in degrees to a formatted hours:minutes:seconds string. No fractional part of the seconds field is given.
degreesToHms( deg, secFig )
  Converts an angle in degrees to a formatted hours:minutes:seconds string with a given number of decimal places in the seconds field.
dmsToDegrees( 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.
hmsToDegrees( 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.
dmsToDegrees( deg, min, 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.

hmsToDegrees( hour, min, 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).

skyDistanceDegrees( ra1, dec1, ra2, dec2 )
  Calculates the separation (distance around a great circle) of two points on the sky in degrees.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@bristol.ac.uk