Am 16.09.2019 um 14:44 schrieb Michael Koch:

> Am 16.09.2019 um 11:06 schrieb Larry woodl@... [guide-user]:
>>
>>
>> Adding an "r" line might help to define the rectangle around the
>> horizon you are
>> wanting to add.
>>
>
> I've tested the "r" command, but it's still the same problem.
> Also I saw there is a "t" command in the object.dat file, but I found
> no documentation for it.
>

Finally I figured out how to create a user-defined horizon. It works in
all zoom levels except the 180° level.
If anyone is interested, you find it at the end of this document:
http://www.astro-electronic.de/FFmpeg_Book.pdf

Michael