Yes. "Girth" in this case is the same as "circumference". And yes, you can measure it at the largest point.
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From the perspective of our solar system, the Sun doesn't move; everything else in the solar system moves around it.In reality, there are NO "fixed points" in the universe; EVERYTHING is moving. The Moon moves around the Earth, the Earth moves around the Sun, the Sun (and our entire solar system) orbit the center of the Milky Way galaxy. All the other galaxies are also moving, and it doesn't make any sense to assume that the Milky Way isn't moving as well - but there is no "stationary spot" in the universe that we can use to measure the Milky Way's movements.
by miles
yes. All the way around the equator the day length doesn't change.
Mary Poppins; Practically Perfect In Every Way.
From the floor to the top of the tank