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).
At the equator, the circumference of the Earth is 40,070 kilometers, and the day is 24 hours long so the speed is 1670 kilometers/hour (1037 miles/hr). This decreases by the cosine of your latitude so that at a latitude of 45 degrees, cos(45) = .707 and the speed is .707 x 1670 = 1180 kilometers/hr.