Ancient Europeans pondered the night sky and grouped stars into mythical figures. Astronomers still sometimes make use of this ancient system of constellations to locate objects. Other cultures found other figures. The tendency to find patterns in random data has been well documented in psychological studies.
The modern notions of force and the relationship between force and motion first were established in Isaac Newton's Philosophiae Naturalis Principia Mathematica (Mathematical principles of natural philosophy), published in 1687. Newton's three laws of motion and his force law for universal gravitation provided a single framework within which the motion of both terrestrial objects (footballs and cannonballs) and celestial objects (moons and planets) could be computed with unprecedented accuracy. Like the unification theories to follow, in addition to integrating two realms of phenomena previously thought to be governed by different laws, the Newtonian synthesis allowed predictions that were subsequently confirmed, including the occurrence of eclipses, cometary returns, and the existence of the planets Neptune and Pluto, which were discovered through their effect on the orbits of other planets.
The investigation of electric and magnetic effects in the nineteenth century led to a unified theory of the electromagnetic force in the set of equations developed by the Scottish physicist James Clerk Maxwell in 1864.
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