Definition of gastrovascular. : functioning in both digestion and circulation the gastrovascular cavity of a coelenterate.
Earth's Circumference at the Equator: 24,901.55 miles (40,075.16 km). Earth's Circumference Between the North and South Poles: 24,859.82 miles (40,008 km). Earth's Diameter at the Equator: 7,926.28 miles (12,756.1 km). Earth's Diameter at the Poles: 7,899.80 miles (12,713.5 km). Average Distance from the Earth to the Sun: 93,020,000 miles (149,669,180 km).
As a consequence, a line of longitude wrapped around the  Earth going through the north and south poles is about 24,859.73  miles, or 40,007.86 km long. That makes the Earth's circumference  about 42 miles longer (about 67 km longer) measured around its  middle than around its poles.