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An 1836 map of Pennsylvania's counties The Federal Information Processing Standard (FIPS) code, used by the U.S. government to uniquely identify counties, is provided with each entry. FIPS codes are five-digit numbers; for Pennsylvania the codes start with 42 and are completed with the three-digit county code.
Counties with a home rule charter may design their own form of county government, but are still generally subject to the County Code (which covers first-, third-, fourth-, fifth-, sixth-, seventh-, and eighth-class counties) or the Second-Class County Code (which covers second-class and second-class A counties). Because home rule charters ...
Unlike other forms of municipalities in Pennsylvania, boroughs and towns are not classified according to population. Boroughs designated in the table below with a dagger (†) are home rule municipalities and are also found in the List of Pennsylvania municipalities and counties with home rule charters, optional charters, or optional plans. The ...
Pennsylvania is a state located in the Northeastern United States. As of the 2020 U.S. census, Pennsylvania is the fifth-most populous state with 13,002,700 inhabitants [1] and the 32nd-largest by land area spanning 44,742.70 square miles (115,883.1 km 2) of land. [2] Pennsylvania is divided into 67 counties and contains 2,560 municipalities.
In Proposition 45 of his Principia, Newton applies his theorem of revolving orbits to develop a method for finding the force laws that govern the motions of planets. [24] Johannes Kepler had noted that the orbits of most planets and the Moon seemed to be ellipses, and the long axis of those ellipses can determined accurately from astronomical ...
Map of the United States with Pennsylvania highlighted. There are 56 municipalities classified as cities in the U.S. state of Pennsylvania. [1] Each city is further classified based on population, with Philadelphia being of the first class, Pittsburgh of the second class, Scranton of the second class A, and the remaining 53 cities being of the third class.
Map of Cambria County, Pennsylvania with Municipal Labels showing Cities and Boroughs (red), Townships (white), and Census-designated places (blue). Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following cities, boroughs and townships are located ...
In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler in 1609 (except the third law, and was fully published in 1619), describe the orbits of planets around the Sun. These laws replaced circular orbits and epicycles in the heliocentric theory of Nicolaus Copernicus with elliptical orbits and explained how planetary ...