Thanks for replying. I've no idea why you're getting downvoted. I do understand the drive towards some kind of exterior criterion to "keep you honest", and I di

Thanks for replying. I've no idea why you're getting downvoted. I do understand the drive towards some kind of exterior criterion to "keep you honest", and I didn't know about the antipodal criterion - which seems too stringent if I'm honest! I don't think I'd begrudge someone the accomplishment if they made it all the way around a single hemisphere.