'Hartsell would no doubt point out that the zeppelin stayed well north of the Equator during her famous "Weltfahrt" ("world journey") and covered less than 22,000 miles as a result.'
It has been a while since geography class, but I thought I recalled Greenwich as being on the zero meridian, not the Equator.
In an ADHD age, I have a hard time imagining this event holding everyone's interest. Perhaps Mr. Hartsell can arrange that reporters will telegraph in messages from the various stopping points, enabling boys to sell special editions of the newspapers on the street corners. I'd offer to donate a manual typewriter to the cause, but I don't know where mine got to.
Hydrogen is also not the only hazard to the lighter-than-air craft. The US Navy wrecked all its zeppelins back in the 1920s.