CONVERT EXAMPLES
Keywords: greg

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CONVERT EXAMPLES

        * Converting relative coordinates to absolute:

        Say  one  wants  to  convert the RADIO-projected coordinates (+100,+200)
        arcseconds from Eq.2000  center  (01:23:45.67,76:54:32.10)  to  absolute
        Eq.2000 coordinates:

          ! Define input offsets
          define double myx myy
          let myx +100
          let myy +200
          ! Define output system of coordinates
          set system eq 2000
          ! Define output projection. NONE means CONVERT output will be absolute
          ! spherical coordinates
          projection /type none
          ! Convert offsets given their input description
          convert 01:23:45.67 76:54:32.10 /type radio /syste eq 2000 /var myx myy /u
          ! Variables are now absolute spherical coordinates (radian unit)
          exa myx myy
          ! Convert from radians to RA-DEC sexagesimal strings
          define char*23 chra chdec
          let chra  myx /sexa h r
          let chdec myy /sexa d r
          exa chra chdec

        * Converting offsets from one projection to another:

        Say one wants to convert the RADIO-projected offsets (+100,+200) arcsec-
        onds away from Eq.2000 center (01:23:45.67,76:54:32.10) to GNOMONIC-pro-
        jected offsets (same projection center):

          ! Define input offsets
          define double myx myy
          let myx +100
          let myy +200
          ! Define output system of coordinates
          set system eq 2000
          ! Define output projection
          projection 01:23:45.67 76:54:32.10 /type gnomonic
          ! Convert offsets given their input description
          convert 01:23:45.67 76:54:32.10 /type radio /syste eq 2000 /var myx myy /u
          ! Variables are now offsets in the new projection (radians)
          exa myx myy