A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Michael Bradley
Date: 2020 Apr 27, 10:44 -0700
'Flipping through HathiTrust, the "Orbit Time" table wasn't in the 1961 reprint of HO 249, but is in the 1970 reprint, with the table itself having values going back to 1965. So I'd guess sometime between 1965-1968.'
1965 is a year I well remember joining a very particular ship - i'll have that year.