At 10:58 2005-07-12 -0400, Bill J Gray wrote in part:

>Hello all,

.............

> If you hit Alt-J and enter
>
>GROUND_DRAWING=2
>
> the ground becomes completely, 100% opaque. This can be annoying
>if you want to look at Jupiter and it isn't up yet; you either have
>to adjust your date/time, or turn off the ground. But some people like
>it that way, because in reality, the ground _is_ opaque.
>
> If instead you enter
>
>GROUND_DRAWING=1
>
> then the ground becomes completely transparent. And if you enter
>
>GROUND_DRAWING=
>
> then the ground reverts to its default, semitransparent state.

Hi Bill

Is there a list of all of the wonderful things one can do with the "Alt-J"
command?

I like to use it to switch between all of the asteroids on the MPCORB file
and the Unusual ones by using ASTFILTER=b after the "Alt-J" which then
causes Guide to display only the asteroids on the 'Add MPC
Comets/Asteroids' file. Could I use the ASTFILTER=c,d,e,f,g...
to select, lets say, only Atens or Apollos or the MPC unusual file or a
list of PHAs or NEAs?


I have read the (30 Jan 2000) item on the History page and would like to
set up some special filtering modes without having to enter the set of
instructions each time I want to change the filter.

Thanks for all of your help.

Bob Elliott
MPC 750/762