Change the coordinate system of the information display. Format: DISPLAY <coordinate\?system> Defaults: None. The default coordinate system on startup is INPUT. Parameters: None. Keywords: The allowed coordinate systems are:
INPUT 
and in the system used to
input the source position;
APPARENT and in geocentric apparent
coordinates;
J2000 and in J2000 mean coordinates;
B1950 and in B1950 mean coordinates;
HA\?DEC Topocentric hour angle and declination.
Examples: DISPLAY J2000
Comments: The systems are described in more detail in
Section 
.
For technical reasons, there are restrictions on the
permitted combinations of input and display coordinates,
as follows:
INPUT always allowed; APPARENT always allowed; J2000 not allowed for input in apparent coordinates; B1950 not allowed for input in apparent or FK5 (J) coordinates; HA\?DEC always allowed.