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David Rittenhouse
David Rittenhouse (April 8, 1732 – June 26, 1796) was an American astronomer, inventor, clockmaker, mathematician, surveyor, scientific instrument craftsman, and public official. Rittenhouse was a member of the American Philosophical Society and the first director of the United States Mint. Biography David Rittenhouse was born on April 8, 1732, in Roxborough Township, Philadelphia County, near a small village within Philadelphia called Rittenhousetown. This village is located near Germantown, along the stream Paper Mill Run, which is a tiny tributary of the Wissahickon Creek. When his uncle, William Rittenhouse, died, David inherited his uncle's carpentry tools and instructional books. At a young age, David showed a high level of intelligence by creating a working scale model of his great-grandfather William Rittenhouse's paper mill. He built other scale models in his youth, like a working waterwheel. David never attended elementary school—he was self-taught from his fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roxborough Township, Pennsylvania
Roxborough is a neighborhood in the Northwest section of the city of Philadelphia, Pennsylvania. It is bordered to the southwest, along the Schuylkill River, by the neighborhood of Manayunk, along the northeast by the Wissahickon Creek section of Fairmount Park, and to the southeast by the neighborhood of East Falls. Beyond Roxborough to the northwest is Montgomery County. Roxborough's ZIP code is 19128. Most of Roxborough is in Philadelphia's 21st Ward. History The Native American trail called the Manatawny, now Ridge Avenue, was central to the well-organized development of farms and plantations within the area then known as Manatawna. The Court of Upland in England appointed local Swedish settler Peter Rambo to be the maintainer of the Manatawny road. In 1690, the road was renamed Ridge Road (it follows the crest of the ridge between the Wissahickon valley and the Schuylkill valley), and the area was renamed Roxburgh, likely named for Roxburghshire, Scotland, the ances ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autodidact
Autodidacticism (also autodidactism) or self-education (also self-learning and self-teaching) is education without the guidance of masters (such as teachers and professors) or institutions (such as schools). Generally, autodidacts are individuals who choose the subject they will study, their studying material, and the studying rhythm and time. Autodidacts may or may not have formal education, and their study may be either a complement or an alternative to formal education. Many notable contributions have been made by autodidacts. Etymology The term has its roots in the Ancient Greek words (, ) and (, ). The related term '' didacticism'' defines an artistic philosophy of education. Terminology Various terms are used to describe self-education. One such is heutagogy, coined in 2000 by Stewart Hase and Chris Kenyon of Southern Cross University in Australia; others are ''self-directed learning'' and ''self-determined learning''. In the heutagogy paradigm, a learner should ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Astronomical Society
The American Astronomical Society (AAS, sometimes spoken as "double-A-S") is an American society of professional astronomers and other interested individuals, headquartered in Washington, DC. The primary objective of the AAS is to promote the advancement of astronomy and closely related branches of science, while the secondary purpose includes enhancing astronomy education and providing a political voice for its members through lobbying and grassroots activities. Its current mission is to enhance and share humanity's scientific understanding of the universe as a diverse and inclusive astronomical community. History The society was founded in 1899 through the efforts of George Ellery Hale. The constitution of the group was written by Hale, George Comstock, Edward Morley, Simon Newcomb and Edward Charles Pickering. These men, plus four others, were the first Executive Council of the society; Newcomb was the first president. The initial membership was 114. The AAS name of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Venus
Venus is the second planet from the Sun. It is sometimes called Earth's "sister" or "twin" planet as it is almost as large and has a similar composition. As an interior planet to Earth, Venus (like Mercury) appears in Earth's sky never far from the Sun, either as morning star or evening star. Aside from the Sun and Moon, Venus is the brightest natural object in Earth's sky, capable of casting visible shadows on Earth at dark conditions and being visible to the naked eye in broad daylight. Venus is the second largest terrestrial object of the Solar System. It has a surface gravity slightly lower than on Earth and has a very weak induced magnetosphere. The atmosphere of Venus, mainly consists of carbon dioxide, and is the densest and hottest of the four terrestrial planets at the surface. With an atmospheric pressure at the planet's surface of about 92 times the sea level pressure of Earth and a mean temperature of , the carbon dioxide gas at Venus's surface is in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valley Forge Medical Center & Hospital
A valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers. In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In areas of limestone bedrock, dry valleys may also result from drainage now taking place underground rather than at the surface. Rift valleys arise principally from earth movements, rather than erosion. Many different types of valleys are described by geographers, using terms that may be global in use or else applied only locally. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Princeton University
Princeton University is a private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the nine colonial colleges chartered before the American Revolution. It is one of the highest-ranked universities in the world. The institution moved to Newark in 1747, and then to the current site nine years later. It officially became a university in 1896 and was subsequently renamed Princeton University. It is a member of the Ivy League. The university is governed by the Trustees of Princeton University and has an endowment of $37.7 billion, the largest endowment per student in the United States. Princeton provides undergraduate and graduate instruction in the humanities, social sciences, natural sciences, and engineering to approximately 8,500 students on its main campus. It offers postgraduate degrees through the Princeton Sch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Pennsylvania
The University of Pennsylvania (also known as Penn or UPenn) is a Private university, private research university in Philadelphia. It is the fourth-oldest institution of higher education in the United States and is ranked among the highest-regarded universities by numerous organizations and scholars. While the university dates its founding to 1740, it was created by Benjamin Franklin and other Philadelphia citizens in 1749. It is a member of the Ivy League. The university has four undergraduate schools as well as twelve graduate and professional schools. Schools enrolling undergraduates include the University of Pennsylvania College of Arts & Sciences, College of Arts and Sciences, the University of Pennsylvania School of Engineering and Applied Science, School of Engineering and Applied Science, the Wharton School of the University of Pennsylvania, Wharton School, and the University of Pennsylvania School of Nursing, School of Nursing. Among its highly ranked graduate schoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orrery
An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; however, since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery – hence the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms. History Ancient versions The Antikythera mechanism, discovered in 1901 in a wreck off the Greek island of Antikythera in the Mediterranean Sea, (it now resides in the National Archaeological Museum of Athens) and extensively studied, exhibited the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Norriton Township, Pennsylvania
East Norriton Township is a township and a census-designated place in Montgomery County, Pennsylvania, United States. The population was 13,590 at the 2010 census. It is served by the Norristown Area School District. History On March 9, 1909, Norriton Township was divided into East Norriton Township and West Norriton Township. The Barley Sheaf Inn and Old Norriton Presbyterian Church are listed on the National Register of Historic Places. Geography East Norriton Township is located at (40.148744, -75.33291). According to the U.S. Census Bureau, the township has a total area of , of which is land and 0.16% is water. East Norriton was recognized by ''Business Week'' as one of the nation's top five ''Best Affordable Suburbs'' in 2009. East Norriton is a former farming community northwest of Philadelphia's city limits, consisting of residential, commercial, and industrial areas. Shopping malls close to East Norriton are the Plymouth Meeting Mall, which is the closest one at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norristown, Pennsylvania
Norristown is a municipality with home rule status and the county seat of Montgomery County, Pennsylvania, United States, in the Philadelphia metropolitan area. Located along the Schuylkill River, approximately from the Philadelphia city limits, Norristown had a population of 34,324 as of the 2010 U.S. Census. It is the fourth most populous municipality in the county and second most populous borough in Pennsylvania. It is the largest non-township municipality in Montgomery County and is located southeast of Allentown and northwest of Philadelphia, the sixth largest city in the United States. History The area where Norristown sits was originally owned by the family of Isaac Norris. Along with William Trent, Norris purchased the land on October 7, 1704, for 50¢ per acre. In 1712, Norris acquired Trent's share and established a gristmill at the foot of present-day Water Street. Named the county seat in 1784 when Montgomery County was formed, Norristown was incorporated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montgomery County, Pennsylvania
Montgomery County is a County (United States), county in the Commonwealth (U.S. state), Commonwealth of Pennsylvania. It is the List of counties in Pennsylvania, third-most populous county in Pennsylvania and the List of the most populous counties in the United States, 73rd-most populous county in the United States. As of the 2020 United States census, 2020 census, the population of the county was 856,553, representing a 7.1% increase from the 799,884 residents enumerated in the 2010 United States Census, 2010 census. Montgomery County is located adjacent to and northwest of Philadelphia. The county seat and largest city is Norristown, Pennsylvania, Norristown. Montgomery County is geographically diverse, ranging from farms and open land in the extreme north of the county to densely populated suburban neighborhoods in the southern and central portions of the county. Montgomery County is included in the Philadelphia-Camden, New Jersey, Camden-Wilmington, Delaware, Wilmington PA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google Books
Google Books (previously known as Google Book Search, Google Print, and by its code-name Project Ocean) is a service from Google Inc. that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition (OCR), and stored in its digital database.The basic Google book link is found at: https://books.google.com/ . The "advanced" interface allowing more specific searches is found at: https://books.google.com/advanced_book_search Books are provided either by publishers and authors through the Google Books Partner Program, or by Google's library partners through the Library Project. Additionally, Google has partnered with a number of magazine publishers to digitize their archives. The Publisher Program was first known as Google Print when it was introduced at the Frankfurt Book Fair in October 2004. The Google Books Library Project, which scans works in the collections of library partners and adds them to the digital inve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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