The ratio between the speeds of revolution of wheel and disc is substantially equal to the reciprocal of the ratio between the diameter of the wheel and the diameter of the mean contact circle on the disc.
The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere
or revolutionary change -- for Marx, the overthrow of one class by another producing a qualitative change in socety; revolutionary change is not to be confused with a coup d'etat (replacement of one leader by another) or with reform (change that does not challenge the position of the class that holds power) Revolutionary change may or may not be violent, depending on how tenaciously the ruling class defends its position
Process of the Earth circling the sun in its orbit Revolution determines the seasons, and the length of the year In addition, differences in seasons occur because of Earth's inclination (tilt on its axis) of about 23 5 degrees as it revolves around the sun Compare with rotation
In the Apache environment, some communities may decide to permit (or encourage) revolutions as ways of reconciling differences, particularly code changes which have been blocked on a particular branch by a veto Originally described by James Duncan Davison in his 'Rules for Revolutionaries,' the concept has been adopted, formally or informally, by at least one Apache project Essentially, a revolution occurs when a group of committers decides to fork the current main branch in order to work on problematic code or concepts This permits them to pursue it without disturbing the evolutionary work on the main branch A revolutionary branch may eventually be merged back into the main branch, die out, split completely and become a new main branch, or may absorb the current main branch into itself (essentially no different than the first option) See the 'Rules for Revolutionaries' and compare evolution
The motion of any body, as a planet or satellite, in a curved line or orbit, until it returns to the same point again, or to a point relatively the same; designated as the annual, anomalistic, nodical, sidereal, or tropical revolution, according as the point of return or completion has a fixed relation to the year, the anomaly, the nodes, the stars, or the tropics; as, the revolution of the earth about the sun; the revolution of the moon about the earth
A revolution in a particular area of human activity is an important change in that area. The nineteenth century witnessed a revolution in ship design and propulsion. In politics, fundamental, rapid, and often irreversible change in the established order. Revolution involves a radical change in government, usually accomplished through violence, that may also result in changes to the economic system, social structure, and cultural values. The ancient Greeks viewed revolution as the undesirable result of societal breakdown; a strong value system, firmly adhered to, was thought to protect against it. During the Middle Ages, much attention was given to finding means of combating revolution and stifling societal change. With the advent of Renaissance humanism, there arose the belief that radical changes of government are sometimes necessary and good, and the idea of revolution took on more positive connotations. John Milton regarded it as a means of achieving freedom, Immanuel Kant believed it was a force for the advancement of mankind, and G.W.F. Hegel held it to be the fulfillment of human destiny. Hegel's philosophy in turn influenced Karl Marx. See also coup d'état. Agricultural Revolution Appalachian Revolution American Revolution Commercial Revolution Cultural Revolution Great Proletarian Cultural Revolution Daughters of the American Revolution February Revolution French Revolution Glorious Revolution Revolution of 1688 Bloodless Revolution green revolution Hungarian Revolution Industrial Revolution July Revolution Mexican Revolution Philippine Revolution Promoters Revolution Russian Revolution of 1905 Russian Revolution of 1917 Revolutions of 1848
sudden or drastic change in a condition; overthrow of a government by the people who are governed and replacement of that government with another; may be a cultural revolution, as in the Industrial Revolution
This is the motion of the earth traveling around the sun It takes the earth 365 days to complete one revolution around the sun This is why there are 365 days in a year The earth is undergoing rotation (see above) and revolution at the same time Return to Seasonal Temperature Effects
the turning of a body about an exterior point or axis The earth revolves about the sun on a 600-million-mile orbit at a speed of about 18 5 miles per second Practical astronomy assumes that the earth is stationary and the celestial bodies move about it from east to west on the celestial sphere
revo·lu·tion·ize revolutionizes revolutionizing revolutionized in BRIT, also use revolutionise When something revolutionizes an activity, it causes great changes in the way that it is done. Over the past forty years plastics have revolutionised the way we live. to completely change the way people do something or think about something
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