Orbital revolution is the cyclical path taken by one object around another object (or point, line, etc.)
In astronomy, the term revolution is most often used to describe the movement of large masses around the center of mass of a system, for example the movement of a moon around a planet or a planet around a star. These orbital revolutions were first described using elliptical orbits by Kepler. Newton later was able to provide a physical model for this motion, now understood to be due to the force of gravity. Our current understanding of gravitation, and therefore of orbital revolution, also owes a great deal to the Theory of relativity developed by Albert Einstein.
Revolution in the physical sense should not be confused with revolution in the sense of political change, although the roots of the terms may be similar.
A political revolution is the forcible replacement of one set of rulers with another (as happened in France and Russia), while a social revolution is the fundamental change in the social structure of a society; many would point to the Spanish Revolution, which occurred parallel to the Spanish Civil War, as an example of this.
A revolution is normally considered to be a relatively swift change: for example, in Spain, in 1936, anarchist and communist groups quickly took control of many areas on the first day of the Civil War (triggered by Franco's attempted coup).
Most anarchists concur with this view of revolution, and the communist view is similar; Cubans speak of "The Revolution" in the present tense, although the act of overthrowing the old Cuban government occurred decades ago.
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