--- In guide-user@yahoogroups.com, Bill J Gray <pluto@p...> wrote:

> Guide will reset its time/date to that of the shadow transition,
> and recenter on the target satellite. Now go to "Animation... Add
> a Trail." Make one trail going "forward" in time, far enough to
> cover the time until the object sets, and another going "backward"
> in time (using a negative step size), until the object rises.
> Make sure that they're of different colors, so you can tell them
> apart.

Negative time. Why didn't I think of that? Actually most satellite
observers would only need the part of the trail that is sunlit.

An easier process might be to select an object from the "List
Satellite Passes" under Tables and select the Exits or Enters Eclipse
time as appropriate, then plot the trail using a negative time step
for "Enters Eclipse" or positive time for "Exits Eclipse" Changing
colors or making a dashed line of the trail is unnecessary with this
process.

> It so happens that we'll be getting a pass
> of Mir this evening in Maine (in bright twilight, unfortunately),
> and this is what it'll look like, with the shadowed section
> in orange:

Actually the ISS but I'm not keeping score. There are some good
passes this weekend.

Thanks for the help.

Cheers,
Don Gardner 39.1799 N, 76.8406 W, 100m ASL
http://hometown.aol.com/mir16609/
http://www.howardastro.org/