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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
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2024-03-29