Around the world in.... five months?

Ferdinand de Magellan's expedition from 1519 to 1522 was the first to complete a circumnavigation of the Earth, and it was a traumatic experience for most of those who set out in five ships from Seville on the 10th of August, 1519. Only one ship with 18 of the original crew returned to Spain on the 6th of September, 1522, and Magellan was not among them, having been killed in the Philippines the previous year. That was 492 years ago, and now there's a solar-powered aircraft ready to try it.

The flight will take five months to complete, so let's have some fun with the math. At the equator, the Earth's circumference is 40,075 Km, or 24,901 miles.
Five months is 152 days. That averages out to 163.82 miles per day, or just 6.82 miles per hour. Probably about the same speed as Magellan's fleet. So my Question Everything today is: "Isn't progress wonderful?"