Hi John,

To get Find_Orb to use that "long time span" file, you can just
change the JPL_FILENAME= line in 'environ.dat', as described at

http://www.projectpluto.com/find_orb.htm#de_eph

For Guide, you should use the 'JPL_EPH=' line described at

http://www.projectpluto.com/update8.htm#de_eph

The problem with putting the new file in place of 'sub_de.406'
is that Guide won't notice that the file now covers a longer time
span. It'll continue to use it only for the years 1800 to 2200.
Only through use of 'JPL_EPH=' can you persuade Guide to simply
use the file over its entire six-millennia span.

-- Bill