The commands coo and pos handle the coordinates. The option "-eq" changes the equinox from 1950 to any other one, and has the meaning of "equinox" only for these two commands. The syntax is the same for both:
> ngc 0129
> coo -eq 2000 200 precess the coordinates to 2000
> pos -eq 1975 200 precess the coordinates to 1975
It should not be confused with
> coo ref -eq 128 Select coordinates from source 128 (GSC).
It is possible to look for the stars which are in a given radius around a center specified by its right ascension and declination.
coo R -lt 1.5 6 44 30 -20 40 00
list the stars within 1.5 'arc around the position
RA = 6 44
30
, DEC = -20
40' 00"
> coo -k 0 27 1 search the stars having a coordinate between 0h 27m 10s and 0h 27m 19s. The same can be done in declination.
The option -k searches for strings of characters, even if they contain white space.
> coo -info 10 list information on reference 10