25 inches in circumference would be the largest normal (not  hydrocephalic) head.    The world record holder is Rick Walters.
Trending Now. Answers. Best Answer: 365 days, 5 hours, 49 minutes and 1.20 seconds (or 365.242375 days). The distance is not so easy; the Earth doesn't travel in a circle through space. With relation to the Sun, it does, but since the Sun is moving, the Earth moves in a helixal orbit.
Nevertheless, the diameter of the Earth still is the first step for us, the residents of this planet, in our attempt to understand the cosmic distance scale. Travel Time The Space Shuttle orbiter, with a velocity of 27,880 km per hour (17,322 miles per hour) takes approximately 90 minutes to orbit, or travel just outside the circumference of the Earth.