A Field Trip to the Moon: Footnotes
 The reader will soon note that we used a mixture of measurement systems in the Apollo Program. We built our rockets and spacecraft using the United States system, flew in space using the nautical system, and explored the moon using the metric system. If you get confused, you will know how the crews felt.
 Eugene A. Cernan, Captain (USN retired) now consults and lives in Houston, Texas.
 Ronald E. Evans, Captain (USN retired) died in 1990 after living and working in Scottsdale, Arizona for many years.