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  2. List of counties in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in...

    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.

  3. List of Pennsylvania municipalities and counties with home ...

    en.wikipedia.org/wiki/List_of_Pennsylvania...

    Home rule municipalities in Pennsylvania enjoy the opposite situation (i.e., they may govern themselves except where expressly forbidden by state law), and are governed according to their unique home rule charter rather than one of the above codes. While most home rule charter municipalities continue to reference their previous forms of ...

  4. Newton's theorem of revolving orbits - Wikipedia

    en.wikipedia.org/wiki/Newton's_theorem_of...

    According to these laws, planets move on ellipses (not epicycles) about the Sun (not the Earth). Kepler's second and third laws make specific quantitative predictions: planets sweep out equal areas in equal time, and the square of their orbital periods equals a fixed constant times the cube of their semi-major axis. [8]

  5. List of municipalities in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_municipalities_in...

    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.

  6. Local government in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Local_government_in...

    Local municipalities can be governed by statutes, which are enacted by the Pennsylvania General Assembly, and are specific to the type and class of municipality; by a home rule municipality, under a home rule charter, adopted by the municipality; or by an optional form of government, adopted by the municipality. [3]

  7. Kepler's laws of planetary motion - Wikipedia

    en.wikipedia.org/wiki/Kepler's_laws_of_planetary...

    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 ...

  8. Regions of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Regions_of_Pennsylvania

    Counties constituting the Pennsylvania Dutch Country Region. Pennsylvania Dutch Country refers to an area of Pennsylvania, which has a high percentage of Amish, Mennonite, and "Fancy Dutch" residents. The Pennsylvania Dutch language was historically common, and is still spoken today by many Amish people residing in the state.

  9. Category:Geography of Pennsylvania by county - Wikipedia

    en.wikipedia.org/wiki/Category:Geography_of...

    This page was last edited on 6 September 2020, at 05:04 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.