• The earth's rotation about its axis is responsible for its being slightly oblate rather than a sphere. (wiktionary.org)
  • Earth's moon completes a rotation every twenty-seven days or so. (wiktionary.org)
  • Do earthquakes affect the earth's rotation? (slate.com)
  • In covering the massive, tsunami-generating earthquake off the northwest coast of Sumatra this weekend, many news outlets picked up a statement from Enzo Boschi, head of Italy's National Institute of Geophysics, saying the temblor was strong enough to disturb the Earth's rotation. (slate.com)
  • According to Richard Gross of NASA's Jet Propulsion Laboratory, it's possible that the Earth's rotation did indeed speed up slightly as a large chunk of the crust fell toward the planet's core, just as a spinning figure skater speeds up when she pulls in her arms. (slate.com)
  • I used a model of the elastic properties of the Earth along with the seismically determined source properties of the earthquake to compute the change in the distribution of the Earth's mass caused by the earthquake, and hence its effect on the Earth's rotation, including the change in the length of the day and in the Earth's wobble," Gross told Explainer in an e-mail. (slate.com)
  • The solar day is gradually getting longer because Earth's rotation is slowing down ever so slightly," says Daniel MacMillan of NASA's Goddard Space Flight Center. (universetoday.com)
  • This leap second accounts for the fact that the Earth's rotation around its own axis, which determines the length of a day, slows down over time while the atomic clocks we use to measure time tick away at almost the same speed over millions of years. (universetoday.com)
  • By the 1950s, scientists had already realized that some scientific measurements and technologies demanded more precise timekeeping than Earth's rotation could provide. (universetoday.com)
  • From the miniscule differences in arrival times, scientists can figure out the positions of the stations and Earth's orientation in space, as well as calculating Earth's rotation speed relative to the quasar positions. (universetoday.com)
  • When the Sun is viewed from the "north" (above the Earth's northern pole) solar rotation is counterclockwise. (wikipedia.org)
  • Cyclonic rotation or circulation is movement in the same direction as the Earth's rotation, as opposed to anticyclonic rotation. (wikipedia.org)
  • Earth's rotation period relative to the Sun (its mean solar day) consists of 86,400 seconds of mean solar time, by definition. (wikipedia.org)
  • Earth's rotation period relative to the fixed stars, called its stellar day by the International Earth Rotation and Reference Systems Service (IERS), is 86164.098 903 691 seconds of mean solar time (UT1) (23h 56m 4.098 903 691s). (wikipedia.org)
  • Earth's rotation period relative to the precessing or moving mean vernal equinox, its sidereal day, is 86164.090 530 832 88 seconds of mean solar time (UT1) (23h 56m 4.090 530 832 88s). (wikipedia.org)
  • Earth's rotation is the rotation of Planet Earth around its own axis. (wikipedia.org)
  • The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. (wikipedia.org)
  • The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica. (wikipedia.org)
  • This is due to the tidal effects the Moon has on Earth's rotation. (wikipedia.org)
  • Not until Nicolaus Copernicus in 1543 adopted a heliocentric world system did the contemporary understanding of earth's rotation begin to be established. (wikipedia.org)
  • In 1600, William Gilbert strongly supported the earth's rotation in his treatise on the earth's magnetism and thereby influenced many of his contemporaries. (wikipedia.org)
  • The earth's rotation implies that the equator bulges and the poles are flattened. (wikipedia.org)
  • Unlike Earth's rotation, a chaotic rotation may not have a fixed axis or period. (wikipedia.org)
  • The Sub-bureau for Rapid Service and Predictions of Earth Orientation Parameters of the IERS, located at the United States Naval Observatory, monitors the Earth's rotation. (wikipedia.org)
  • UT1 is the non-uniform time defined based on the Earth's rotation. (wikipedia.org)
  • Crop rotation is the practice of growing a series of dissimilar or different types of crops in the same area in sequenced seasons . (wikipedia.org)
  • Agriculturalists have long recognized that suitable rotations-such as planting spring crops for livestock in place of grains for human consumption-make it possible to restore or to maintain a productive soil. (wikipedia.org)
  • George Washington Carver (1860s-1943) studied crop-rotation methods in the United States , teaching southern farmers to rotate soil-depleting crops like cotton with soil-enriching crops like peanuts and peas . (wikipedia.org)
  • crop rotation An agricultural practice in which different crops are cultivated in succession on the same area of land over a period of time so as to maintain soil fertility and reduce the adverse effects of pests. (encyclopedia.com)
  • In the UK, other crops that may be included in a typical four-stage rotation are wheat, barley, and root crops. (encyclopedia.com)
  • crop rotation Practice of successively growing different crops on the same field. (encyclopedia.com)
  • Crop rotation can get a lot more complex than that, further sorting the vegetable families into six categories instead of four and keeping track of the varying size of the plots that get allotted to different crops. (selfgrowth.com)
  • Crop rotation , the successive cultivation of different crops in a specified order on the same fields, in contrast to a one-crop system or to haphazard crop successions. (britannica.com)
  • Throughout human history, wherever food crops have been produced, some kind of rotation cropping appears to have been practiced. (britannica.com)
  • The first number in a rotation ratio refers to cultivated row crops, the second to close-growing grains, and the third to sod-forming, or rest, crops. (britannica.com)
  • It is desirable to include legumes alone or in mixtures with nonlegume sod-forming crops as a regular crop in many field rotations. (britannica.com)
  • In addition to the many beneficial effects on soils and crops, well-planned crop rotations also provide the business aspects of farming with advantages. (britannica.com)
  • rotation of crops, agricultural practice of varying the crops on a piece of land in a planned series, to save or increase the mineral or organic content of the soil, to increase crop yields, and to eradicate weeds, insects, and plant diseases. (factmonster.com)
  • The methyl bromide simulates a recommended crop rotation where a broadleaf crop is grown between small grain crops. (ndsu.edu)
  • Common techniques used by organic farmers to manage soil quality -- which involves not just the soil itself but also water, weeds, disease and pests -- include the use of animal manure, compost , cover crops, green manures and crop rotation. (howstuffworks.com)
  • Kierkegaard likens the rotation method to the crop rotation used in agriculture, in which the soil is constantly rotated in order to maximize the use of nutrients for the crops. (wikipedia.org)
  • The Cullars Rotation consists of three sets of 14 soil treatments, with one set of treatments for each of the three crops (cotton, corn, and wheat and soybeans) in the rotation. (wikipedia.org)
  • When discussing crop rotations, crops are classified in different ways depending on what quality is being assessed: by family, by nutrient needs/benefits, and/or by profitability (i.e. cash crop versus cover crop). (wikipedia.org)
  • However, many farmers have success managing rotations by planning sequencing and cover crops around desirable cash crops. (wikipedia.org)
  • Forestry portal Biomass Bioenergy Energy forestry Miscanthus Non food crops Poplar Short rotation coppice Switchgrass Wood fuel POPFULL project Harvesting of Salix and Populus ROKWOOD Project: 7th Framework European Project on Short Rotation Woody Plantations (SRPs or SRCs). (wikipedia.org)
  • By affecting the soil in different ways, crops in a rotation help to stabilise changes in these properties. (wikipedia.org)
  • The distinction is significant in crop rotation strategies, where land is planted with row crops, commodity food grains, and sod-forming crops in a sequence meant to protect the quality of the soil while maximizing the soil's annual productivity. (wikipedia.org)
  • The right rotation operation as shown in the adjacent image is performed with Q as the root and hence is a right rotation on, or rooted at, Q. This operation results in a rotation of the tree in the clockwise direction. (wikipedia.org)
  • An alternative convention uses rotating axes, and the above matrices also represent a rotation of the axes clockwise through an angle θ. (wikipedia.org)
  • This is given by the formula L = I ω for large objects with a known moment of inertia (wheels, hula hoops, tops, etc.), or by L = rmv t for point masses a distance r from the center of their circular rotation (a charged particle in a magnetic field, or the earth orbiting the sun). (shmoop.com)
  • The ratio of the two (how heavy is it to start, stop, or otherwise change rotation) is given by the moment of inertia. (wikipedia.org)
  • Rotation about each unique axis is associated with a set of quantized energy levels dependent on the moment of inertia about that axis and a quantum number. (wikipedia.org)
  • A plane rotation around a point followed by another rotation around a different point results in a total motion which is either a rotation (as in this picture), or a translation . (wikipedia.org)
  • However, a rotation around a point or axis and a rotation around a different point/axis may result in something other than a rotation, e.g. a translation. (wikipedia.org)
  • i.e., an element of E+(3): it can also be the identity, a rotation with a translation along the axis, or a pure translation. (wikipedia.org)
  • The screw has an axis which is a line in 3D space (not necessarily through the origin, and the screw also has a finite pitch (a fixed translation along its axis corresponding to a rotation about the screw axis. (wikipedia.org)
  • The planar displacement of a body from position 1 to position 2 is defined by the combination of a planar rotation and planar translation. (wikipedia.org)
  • If a sequence of non-collinear boosts returns an object to its initial velocity, then the sequence of Wigner rotations can combine to produce a net rotation called the Thomas precession. (wikipedia.org)
  • The rotation group is a Lie group of rotations about a fixed point . (wikipedia.org)
  • In rotation, each member of the group would be responsible for the beacon fire. (wiktionary.org)
  • Spotting a sector rotation, when money moves from one sector or group of sectors into another because of the business cycle, is of the utmost importance. (cnbc.com)
  • Use the ad rotation setting to specify how often you'd like the ads in your ad group to be served relative to one another. (google.com)
  • A simple rotation would be one crop from each group with a 1:1:1 ratio. (britannica.com)
  • This subset includes all adult respondents in the outgoing rotation group each month. (nber.org)
  • But only one fourth of the sample is in an outgoing rotation group. (nber.org)
  • Since θ is irrational, the rotation has infinite order in the circle group and the map Tθ has no periodic orbits. (wikipedia.org)
  • A week of Tabor Rotation also includes whole-group mini-lessons, robust vocabulary development, readiness grouping, and journal writing. (wikipedia.org)
  • A key to Tabor Rotation's effectiveness is that it spirals a concept through multiple stations and reviews it periodically when a game or activity is cycled back into the rotation or into whole-group mini-lessons. (wikipedia.org)
  • Note that the two-dimensional case is the only non-trivial (i.e. not one-dimensional) case where the rotation matrices group is commutative, so that it does not matter in which order multiple rotations are performed. (wikipedia.org)
  • Recurrent rotation refers to a group of songs still frequently aired on a contemporary hit radio station several months or even years after the initial debut. (wikipedia.org)
  • Furthermore, the rotation group is nonabelian. (wikipedia.org)
  • The symmetry group of a swastika or any similar figure without an axis of symmetry is a rotation group. (wikipedia.org)
  • It can be used to establish barriers to internal rotation such as that associated with the rotation of the CH 3 group relative to the C 6H 4Cl group in chlorotoluene (C 7H 7Cl). (wikipedia.org)
  • The rapid rotation causes the planet's equator to bulge out. (universetoday.com)
  • The rotation of Jupiter at its poles takes about 5 minutes longer than the rotation of Jupiter at its equator. (universetoday.com)
  • System 1 is for latitudes 10 degrees north and south of Jupiter's equator - the rotation is 9 hours 50 minutes. (universetoday.com)
  • This rotation induces a centrifugal acceleration in the reference frame of the Earth which slightly counteracts the effect of gravity the closer one is to the equator. (wikipedia.org)
  • The rate of surface rotation is observed to be fastest at the equator (latitude φ = 0 °), and to decrease as latitude increases. (wikipedia.org)
  • The solar rotation period is 24.47 days at the equator and almost 38 days at the poles. (wikipedia.org)
  • A current set of accepted average values is: A= 14.713 ± 0.0491 °/d B= -2.396 ± 0.188 °/d C= -1.787 ± 0.253 °/d At the equator the solar rotation period is 24.47 days. (wikipedia.org)
  • Like a rotating planet bulging at the equator, the sphere deforms into an oblate (squashed) spheroid depending on its rotation. (wikipedia.org)
  • The rotation also gives rise to gravity darkening at the equator, as described by the von Zeipel theorem. (wikipedia.org)
  • The poles make one rotation every 34.3 days and the equator every 25.05 days, as measured relative to distant stars (sidereal rotation). (wikipedia.org)
  • Any rotation is a motion of a certain space that preserves at least one point . (wikipedia.org)
  • This (common) fixed point is called the center of rotation and is usually identified with the origin . (wikipedia.org)
  • The pivot point for the node's position, rotation, and scale. (apple.com)
  • This is similar to 2D rotation about an arbitrary point. (siggraph.org)
  • This is directly analogous to the 2D case of rotation about a point. (siggraph.org)
  • If a rotation around a point or axis is followed by a second rotation around the same point/axis, a third rotation results. (wikipedia.org)
  • A rotation flap is a semicircular skin flap that is rotated into the defect on a fulcrum point. (wikipedia.org)
  • This presentation is convenient only for rotations about a fixed point. (wikipedia.org)
  • In 3D, equivalently it is the combination of a rotation and an inversion in a point on the axis. (wikipedia.org)
  • Rotoreflection and rotoinversion are the same if they differ in angle of rotation by 180°, and the point of inversion is in the plane of reflection. (wikipedia.org)
  • Station DJs will review an album and write in a level of desired rotation (generally Light, Medium, Heavy) at which point the music director will then decide whether or not that CD is put into rotation or simply added to the station's library. (wikipedia.org)
  • If the cart was stuck halfway, at the top of the wheel, at that point its angle of rotation was only 180 degrees. (wikipedia.org)
  • As shown in the figure, the economically optimum rotation age is determined at point R, which gives the maximum net present value of expected benefit/profit. (wikipedia.org)
  • Hence, optimum rotation age in biological terms is taken to be the point where the slope of MAI is equal to zero, which is also equivalent to the intersection of the MAI and the periodic annual increment (PAI). (wikipedia.org)
  • The instant centre of rotation, also called instantaneous velocity center, or also instantaneous centre or instant centre, is the point fixed to a body undergoing planar movement that has zero velocity at a particular instant of time. (wikipedia.org)
  • This point is the pole of the planar displacement, and the displacement can be viewed as a rotation around this pole. (wikipedia.org)
  • Every plane B that is completely orthogonal to A intersects A in a certain point P. Each such point P is the centre of the 2D rotation induced by R in B. All these 2D rotations have the same rotation angle α. (wikipedia.org)
  • These groups consist of rotations around a point. (wikipedia.org)
  • Left rotation refers to the following In an array, moving all items to the next lower location. (wikipedia.org)
  • In aviation, rotation refers to the action of applying back pressure to a control device, such as a yoke, side-stick or centre stick, to lift the nose wheel off the ground during the takeoff roll. (wikipedia.org)
  • Their research showed that the reaction time for participants to decide if the pair of items matched or not was linearly proportional to the angle of rotation from the original position. (wikipedia.org)
  • Researchers have argued that the increased brain activation, increased time, and increased error rates indicate that task difficulty is proportional to the angle of rotation. (wikipedia.org)
  • But with the markets hitting new all-time highs month after month, stock or sector rotation has become a term that investors are following and using to adjust their portfolio. (forbes.com)
  • In general, most rotations are confined to time limits of eight years or less. (britannica.com)
  • The briefing also discusses impacts on training and readiness, such as amount of training time available between rotations, turnover of brigades within divisions, and incompatibility of equipment between Europe and CONUS locations. (rand.org)
  • To help our members and others in the graduate medical education community have more time for education and training, the AAMC developed a uniform agreement to be used for resident rotations. (aamc.org)
  • It takes the same amount of time for the Moon to complete a full orbit around the Earth as it takes for it to complete one rotation on its axis. (universetoday.com)
  • In other words, the Moon rotation time is 27.3 days, just the same as its orbital time: 27.3 days. (universetoday.com)
  • He's done that job before and from there he can gain experience to work his way into the rotation at some time in the future. (mlb.com)
  • At the time of the dinosaurs, Earth completed one rotation in about 23 hours," says MacMillan, who is a member of the VLBI team at NASA Goddard. (universetoday.com)
  • Another time standard, called Universal Time 1 (UT1), is based on the rotation of Earth on its axis with respect to the sun. (universetoday.com)
  • the last time I tried implementing a camera class and rotations and that stuff I failed. (gamedev.net)
  • Play media The Carrington rotation is a system for comparing locations on the Sun over a period of time, allowing the following of sunspot groups or reappearance of eruptions at a later time. (wikipedia.org)
  • Because the Solar rotation is variable with latitude, depth and time, any such system is necessarily arbitrary and only makes comparison meaningful over moderate periods of time. (wikipedia.org)
  • The longitude is measured by the time of crossing the central meridian and based on the Carrington rotations. (wikipedia.org)
  • A single left rotation is done in O(1) time but is often integrated within the node insertion and deletion of binary search trees. (wikipedia.org)
  • Opioid rotation requires strict monitoring in patients with ongoing levels of high opioid doses for extended periods of time, since long term opioid use can lead to a patient developing tolerance to the analgesic effects of the drug. (wikipedia.org)
  • Wick rotation relates statics problems in n dimensions to dynamics problems in n − 1 dimensions, trading one dimension of space for one dimension of time. (wikipedia.org)
  • In the above diagram for the root Q, the RS is C and the OS is P. The pseudo code for the rotation is: Pivot = Root.OS Root.OS = Pivot.RS Pivot.RS = Root Root = Pivot This is a constant time operation. (wikipedia.org)
  • New evidence suggests that our galaxy and other have settled into an orderly, disk-like rotation over the past 8 billion years[not in citation given] and that other galaxies are slowly following suit over time. (wikipedia.org)
  • It has the ability to trigger rotation based on file size, time or interval (or any combination thereof). (wikipedia.org)
  • Part of its mission involves the determination of a time scale based on the current rate of the rotation of the Earth. (wikipedia.org)
  • Goldstein: The spatial rotation resulting from the successive application of two non-collinear Lorentz transformations have been declared every bit as paradoxical as the more frequently discussed apparent violations of common sense, such as the twin paradox. (wikipedia.org)
  • The naive algorithm for finding the lexicographically minimal rotation of a string is to iterate through successive rotations while keeping track of the most lexicographically minimal rotation encountered. (wikipedia.org)
  • The resulting mosaic has been mapped onto a sphere, and one full rotation is presented in the visualization. (hubblesite.org)
  • In this movie, strung together from a series of images provided by the framing camera on NASA's Dawn spacecraft, we see a full rotation of Vesta, which occurs over the course of roughly five hours. (nasa.gov)
  • It has made a full rotation meaning it has rolled a distance equal to its circumference. (wikipedia.org)
  • The Cullars Rotation is a soil fertility experiment on the Auburn University campus in Auburn, Alabama and is listed on the National Register of Historic Places. (wikipedia.org)
  • The Cullars Rotation experiment, which started in 1911, is the oldest ongoing cotton fertility experiment in the United States, the oldest soil fertility experiment in the Southern United States, and the second oldest continuous cotton experiment in the world. (wikipedia.org)
  • The Old Rotation is a soil fertility experiment on the Auburn University campus in Auburn, Alabama. (wikipedia.org)
  • The planet's rotation is slowing down overall because of tidal forces between Earth and the moon. (universetoday.com)
  • Here on Earth, the fastest winds are only capable of reaching between 10 and 20 percent of the planet's rotation. (universetoday.com)