In 21:16, the angel measures the city with a golden rod or reed, and records it as 12,000 stadia by 12,000 stadia at the base, and 12,000 stadia high. A stadion is usually stated as 185 meters, or 607 feet, so the base has dimensions of about 2220 km by 2220 km, or 1380 miles by 1380 miles. In the ancient Greek system of measurement, the base of the New Jerusalem would have been equal to 144 million square stadia, 4.9 million square kilometers or 1.9 million square miles (roughly midway between the sizes of Australia and India). If rested on the Earth, its ceiling would be inside the upper boundary of the exosphere but outside the lower boundary. By way of comparison, the International Space Station maintains an orbit with an altitude of about 386 km (240 mi) above the earth.