Alex and Jim,

I just did a search from Project Pluto's home page and came up with two
hits which may help. Somewhere, either in the users' group posts or the
Project Pluto site, I believe I've seen how to tailor your Guide horizon to
match your real horizon, hills, buildings, etc. Guide has such a wealth of
information, and so many possiblities for modification, it's hard to keep
up with all of it. Check these out, if they don't help, do some intensive
searching on Guide's website. I didn't have time to do more.

Larry
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Undocumented features in Guide: http://www.projectpluto.com/useless.htm
"Showing compass points on the horizon"
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http://www.projectpluto.com/update8b.htm
(4 May 2002) "More interesting horizon:" If you've customized your horizon
(read the comments at the end of HORIZON.DAT in your Guide directory for
information about how to do that), you should ignore this. (Or at the very
least, back up your HORIZON.DAT and OBJECTS.DAT files before trying it.)

The default horizon in Guide is intended largely to provide a frame of
reference, with a few houses, trees, cars, mountains, streetlights and
other objects scattered around. Turn these on (with the "Horizon Objects"
check-box in the Display... Background dialog), and you have some objects
that let you look at the screen and think: "There's a tree there; that must
be the horizon." It's also a good starting point for customizing your own
horizon; you can move the objects around or replicate them at different
positions ("put a tree here, here, and here") to get something that looks
like what would actually appear as seen from your observing site.

If you download this file (about 5 KBytes) to your Guide directory and
unZIP it, the horizon will be replaced by one that is at least slightly
more interesting. The all-sky chart in the center of Sky & Telescope shows
a slight purple tint near the horizon, as well as a church with a steeple
on the horizon; I've borrowed both of these features for the new horizon.
The mountain is now snow-capped
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At 04:28 PM 8/22/2005 +0800, you wrote:

>Me too, can you tell me what you use to open and edit horizon.dat, I would
>love to get rid of that aeroplane and add a couple of hills to suit my
>horizon.
>
>Jim Gifford.

Laren Dart
http://ldart.got.net