WebMar 13, 2024 · Earth is the largest and most massive of the rocky inner planets, although it is dwarfed by the gas giants beyond the Asteroid Belt. Its diameter. Earth is an oblate spheroid. This means it is spherical in … WebThe radius and period of the Moon’s orbit was measured with reasonable accuracy thousands of years ago. From the astronomical data in Appendix D, the period of the Moon is 27.3 days = 2.36 × 10 6 s, and the average distance between the centers of Earth and the Moon is 384,000 km. Solution Solving for M E ,
World Geodetic System - Wikipedia
WebOct 24, 2003 · Earth – 3,959mi (6,371km) radius. Mars – 2,106mi (3,390km) radius; about half the size of Earth. Jupiter – 43,441mi (69,911km) radius; 11x Earth’s size. Saturn – 36,184mi (58,232km) radius; 9x larger than … WebThe mechanical ellipticity of the earth (dynamical flattening, symbol J 2) is determined to high precision by observation of satellite orbit perturbations. Its relationship with the geometric flattening is indirect. The relationship depends on the internal density distribution. ... Authalic mean radius = = 6 371 007.1809 m; Radius of a sphere ... churchill shoes factory shop
Sun Fact Sheet - NASA
WebFeb 7, 2024 · Earth's moon is the brightest object in our night sky. But how big is the moon? The moon's mean radius is 1,079.6 miles (1,737.5 kilometers) and the mean diameter is 2,159.2 miles (3,475... A sphere. In the case of the geoid and ellipsoids, the fixed distance from any point on the model to the specified center is called "a radius of the Earth"or "the radius of the Earth at that point". [d]It is also common to refer to any mean radiusof a spherical model as "the radius of the earth". See more Earth radius (denoted as R🜨 or $${\displaystyle R_{E}}$$) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid, the radius ranges from a … See more The following radii are derived from the World Geodetic System 1984 (WGS-84) reference ellipsoid. It is an idealized surface, and the … See more The Earth can be modeled as a sphere in many ways. This section describes the common ways. The various radii derived here use the notation and dimensions noted above for the Earth as derived from the WGS-84 ellipsoid; namely, Equatorial radius: a … See more Earth's diameter is simply twice Earth's radius; for example, equatorial diameter (2a) and polar diameter (2b). For the WGS84 ellipsoid, that's respectively: • 2a = 12,756.2740 km (7,926.3812 mi), • 2b = 12,713.5046 km (7,899.8055 mi). See more Earth's rotation, internal density variations, and external tidal forces cause its shape to deviate systematically from a perfect sphere. Local topography increases the variance, resulting in a surface of profound complexity. Our descriptions of Earth's surface must be … See more Geocentric radius The geocentric radius is the distance from the Earth's center to a point on the spheroid surface at See more The mathematical expressions above apply over the surface of the ellipsoid. The cases below considers Earth's topography, above or below a reference ellipsoid. As such, they are topographical geocentric distances, Rt, which depends not only on latitude. See more WebFeb 6, 2024 · R e = 1 AU and T e = 1 earth-year ( T n) 2 = ( R n) 3 ( T n) 2 = ( 1.262) 3 ( T n) 2 = 2.0099 T n = 1.412 y e a r s This is the full orbit time, but a a transfer takes only a half orbit (1.412/2 = 0.7088 year). Therefore the shortest orbital path to Mars from Earth takes about 8 months. churchill sheds liverpool