Hello,

I would like to create a trail to demonstrate, how a planet moves in
relation to an other planet or the sun.

This could be used to generate visibility diagrams of mercury during
twilight or to explain the relative motion of sund and moon during
conjunction.

This would require fixing one object in the field of view and creating
trails for one or many others. Non mooving objects should probaly be
invisible for this kind of display.

Is that possible today? Could it be added?

Regards, Martin