jump to other results. 1  1[countable] a particular attitude towards something; a way of thinking about something synonym viewpoint a global perspective Recent events seem less serious when put into an international perspective.
Low earth orbit is only slightly above the Earth, by outer space standards, 124 - 1240 miles (200 - 2000 km) in altitude. Below 124 miles, orbits rapidly degrade, causing surface impact, and above 1,240 miles or even less, the Earth's radiation belts damage electronic equipment, necessitating special shielding. The region from 1,243 miles altitude to geostationary orbit (35,786 kilometers or 22,236 mi) is known as Medium Earth Orbit.
Our moons average distance from the Earth is 238,857 miles (384,399 kilometers). However the Moonâs orbit is elliptical and the distance therefore varies during its orbit though, from around 252,088 miles (405,696 kilometers) at its furthest (Apogee) to 225,622 miles (363,104 kilometers) at its closest (Perigee).