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 384,399 km (238,854 miles). [The average center to center distance is 384,403 kilometers] However the Moon's orbit is elliptical and the distance therefore varies during its orbit though, from around 405,696 km (252,088 miles) at its furthest (Apogee) to 363,104 km (225,622 miles) at its closest (Perigee).