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

> ...
> About asteroids: one problem I ran into with Guide 8 is
> that there are about five times as many asteroids as there
> were for the first Guide 7 disks. I had to do several things
> to accommodate this. ...
> I still had to reduce the range of dates supplied to run from about
> 1960 to 2023.
>
> ... In the meantime, we are stuck with a shorter
> range of dates than I would like. (The data in the 1950s was
> especially useful when dealing with DSS images from that era.
> You could zoom in on such an image, spot an asteroid trail,
> and usually identify it pretty quickly.) ...
>
> -- Bill

I tried the experiment of using the Guide 7 asteroid element files,
which go back to 1941, with Guide 8. It worked, the positional
differences between the program versions being less than 0.02". All I
did was copy the folders 2429, 2430 through 2436 from
<drive_7>\asteroid\asteroid\ to <drive_8>\asteroid\asteroid\ where
<drive_n> is the path to the Guide n data files.

This presumes, of course, that you've installed the Guide asteroid
data to your hard drive. Also, the Guide 7 data files are limited to
the first 9000 or so asteroids.

Ross Shuart