Earth radius (denoted as R🜨 or R E {\displaystyle R_{E}} ) is the distance from the center of Earth to a point on or near its surface. Approximating the...

Earth for calculation of line-of-sight paths from maps, when a direct visual fix cannot be made. Designs for microwave formerly used 4⁄3 Earth radius...

earthshine is [ Earth albedo × (Earth radius / Radius of Moon's orbit)2 ] relative to the direct solar illumination that occurs for a full moon. (Earth albedo...

and shape of the Earth. The simplest model for the shape of the entire Earth is a sphere. The Earth's radius is the distance from Earth's center to its surface...

The term "super-Earth" is also used by astronomers to refer to planets bigger than Earth-like planets (from 0.8 to 1.2 Earth-radius), but smaller than...

the average radius of Jupiter, 109 times the radius of the Earth, and 1/215th of an astronomical unit, the approximate distance between Earth and the Sun...

20% of Earth’s radius or 70% of the Moon's radius. There are no samples of Earth's core accessible for direct measurement, as there are for Earth's mantle...

be related to the equatorial radius and the polar radius, respectively a and b (see: Earth polar and equatorial radius of curvature). Then, the flattening...

why the polar circumference of the Earth is actually 40,008 kilometres, instead of 40,000. Earth radius Spherical Earth Nautical mile Geographical mile Arabic...

are in LEO, with an altitude never more than about one-third of the radius of Earth (or about 2000 kilometers). The term LEO region is also used for the...

See Figure of the Earth and Earth radius § Global radii for details. Recent measurements from satellites suggest that Earth is actually slightly pear-shaped...

radius of the sphere. The Earth is nearly spherical, so great-circle distance formulas give the distance between points on the surface of the Earth correct...

The Jupiter radius or Jovian radius (RJ or RJup) has a value of 71,492 km (44,423 mi), or 11.2 Earth radii (R🜨) (one Earth radius equals 0.08921 RJ)....

values, such as the mass, radius, and rotation of Earth. The measurement is also useful in characterizing the lunar radius, as well as the mass of and...

of the Earth in the 17th century were based on a circumference estimate of 60 miles (97 km) to the degree of latitude, corresponding to a radius of 5,500 km...

latitudinal changes in the Earth's magnetic field, sudden ionospheric disturbances, polar cap absorption, variation in the Earth radius of ± 11 km from equator...

distance, R = (X2 + Y2 + Z2)0.5, which is a generalization of the geocentric radius, R0, not restricted to points on the reference ellipsoid surface. The geocentric...

osculating sphere. With respect to Earth, the center of the true horizon is below the observer and below sea level. Its radius or horizontal distance from the...

layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or...

naked eye. Kepler-22b's radius is roughly twice that of Earth. Its mass and surface composition are unknown. However, an Earth-like composition for the...

on the surface of the Earth, d is depth and R is the radius of the Earth. If the density decreased linearly with increasing radius from a density ρ0 at...

atmosphere and outer space. The Kármán line, at 100 km (62 mi) or 1.57% of Earth's radius, is often used as the border between the atmosphere and outer space...

planets. Objects must orbit Earth within this radius, or they can become unbound by the gravitational perturbation of the Sun. Earth, along with the Solar System...

radius or the gravitational radius is a physical parameter in the Schwarzschild solution to Einstein's field equations that corresponds to the radius...

}{180}}M_{r}\cos \phi \!} where Earth's average meridional radius M r {\displaystyle \textstyle {M_{r}}\,\!} is 6,367,449 m. Since the Earth is an oblate spheroid...

atmosphere is thin relative to the Earth's radius—especially the dense atmospheric layer at low altitudes—the Earth's gravitational acceleration as a function...

(February 2023). "Evidence for the volatile-rich composition of a 1.5-Earth-radius planet". Nature Astronomy. 7 (2): 206–222. arXiv:2212.08477. Bibcode:2023NatAs...

present sea level, comparing sea levels in the past with the level today. Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator. It is 6...

compute the Earth's circumference, which was close to modern values of the Earth's circumference. His estimate of 6,339.9 km for the Earth radius was only...

a "waterworld". It is a super-Earth, meaning it is larger than Earth but is significantly smaller (in mass and radius) than the gas giants of the Solar...