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Strauss and Howe describe these turnings as the "seasons of history". At one extreme is the Awakening, which is analogous to summer, and at the other extreme is the Crisis, which is analogous to winter. The turnings in between are transitional seasons, the High and the Unraveling are similar to spring and autumn, respectively. [48]
The Chandler wobble or Chandler variation of latitude is a small deviation in the Earth's axis of rotation relative to the solid earth, [1] which was discovered by and named after American astronomer Seth Carlo Chandler in 1891. It amounts to change of about 9 metres (30 ft) in the point at which the axis intersects the Earth's surface and has ...
Effects of precession on the seasons (using the Northern Hemisphere terms) As the orientation of Earth's orbit changes, each season will gradually start earlier in the year. Precession means the Earth's nonuniform motion (see above) will affect different seasons. Winter, for instance, will be in a different section of the orbit.
North Pole direction (rotation axis direction) Vernal equinox direction; Orbit eccentricity; Year duration; Orbit plane inclination; All these factors affect how much energy from Sun falls on all the points at a same given latitude (i.e. a parallel) on the planet during daytime; if such amount of energy changes during the year, the planet has ...
The rotation group is a Lie group of rotations about a fixed point. This (common) fixed point or center is called the center of rotation and is usually identified with the origin. The rotation group is a point stabilizer in a broader group of (orientation-preserving) motions. For a particular rotation: The axis of rotation is a line of its ...
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A rotation can be represented by a unit-length quaternion q = (w, r →) with scalar (real) part w and vector (imaginary) part r →. The rotation can be applied to a 3D vector v → via the formula = + (+). This requires only 15 multiplications and 15 additions to evaluate (or 18 multiplications and 12 additions if the factor of 2 is done via ...
In the three-game wild-card round or the five-game Division Series, teams don’t need a full four-man rotation and can get by with three starters. Sometimes, as we saw this postseason with the ...