AIPS HELP file for IMPOS in 31DEC18
As of Wed Jul 18 23:49:42 2018
IMPOS: Verb to determine the absolute coordinates under cursor
@ Output adverb
TVBUT @ Value of button(s) pushed.
COORDINA @ Celestial coordinate found
Use: Read a celestial position from a TV image using cursor;
Print result on terminal and in log.
Input adverbs: none
TVBUT.......Value of button(s) pushed: 1, 2, 4, or 8 are likely
but combinations may be possible.
COORDINA....The X and Y coordinates are found as:
Xpos = abs(CO(1)) + abs(CO(2))/60 + abs(CO(3))/3600
if any of CO(1), CO(2), CO(3) < 0: Xpos = -Xpos
Ypos = abs(CO(4)) + abs(CO(5))/60 + abs(CO(6))/3600
if any of CO(4), CO(5), CO(6) < 0: Ypos = -Ypos
Note that, although these are most suited to RA, Dec in
sexagesimal notation, they can be used for any type of
coordinate. The units are standard FITS units (e.g
degrees, m/sec, Hz, sec, etc.) except that right
ascensions are in hours of time.