Thanks to Selden, I discovered that the Users Guide I wrote for Celestia 1.6.0 in 2014, had not been updated since 1.6.1 came out. That is now corrected. I have posted a new Users Guide for 1.6.1 on the motherlode, at http://www.celestiamotherlode.net/catalog/documentation.html
Since the celestia.space webpage only lists a link to the guide for 1.6.0, it should be updated also to reference the new guide.
Enjoy
Frank
