Search results
Results From The WOW.Com Content Network
A press release on February 3, 2009, showed a sixth new moon found by Cassini. The moon is approximately 500 m (0.3 mi) in diameter within the G-ring of the ring system of Saturn, and is now named Aegaeon (formerly S/2008 S 1). [76] A press release on November 2, 2009, mentions the seventh new moon found by Cassini on July 26, 2009.
v. t. e. Geodesy or geodetics[ 1] is the science of measuring and representing the geometry, gravity, and spatial orientation of the Earth in temporally varying 3D. It is called planetary geodesy when studying other astronomical bodies, such as planets or circumplanetary systems. [ 2]
Another type of sphere arises from a 4-ball, whose three-dimensional surface is the 3-sphere: points equidistant to the origin of the euclidean space R 4. If a point has coordinates, P ( x , y , z , w ) , then x 2 + y 2 + z 2 + w 2 = 1 characterizes those points on the unit 3-sphere centered at the origin.
The three possible plane-line relationships in three dimensions. (Shown in each case is only a portion of the plane, which extends infinitely far.) In analytic geometry, the intersection of a line and a plane in three-dimensional space can be the empty set, a point, or a line. It is the entire line if that line is embedded in the plane, and is ...
In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events ...
e. In physics, the n-body problem is the problem of predicting the individual motions of a group of celestial objects interacting with each other gravitationally. [ 1] Solving this problem has been motivated by the desire to understand the motions of the Sun, Moon, planets, and visible stars. In the 20th century, understanding the dynamics of ...
This is the convention followed in this article. In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a given point in space is specified by three real numbers: the radial distance r along the radial line connecting the point to the fixed point of origin; the polar angle θ ...
Spherical Earth or Earth's curvature refers to the approximation of the figure of the Earth as a sphere . The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. [ 1][ 2] In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of ...