The compass is a magnetometer used for navigation and orientation that shows direction in regards to the geographic cardinal points.The structure of a compass consists of the compass rose, which displays the four main directions on it: East (E), South (S), West (W) and North (N). The angle increases in the clockwise position. North corresponds to 0°, so east is 90°, south is 180° and west is 270°. The history of the compass started more than 2000 years ago during the Han dynasty (202 BC – 220 AD). The first compasses were made of lodestone, a naturally magnetized stone of iron, in Han dynasty China. It was called the "South Pointing Fish" and was used for land navigation by the mid-11th century during the Song dynasty (960–1279 AD). Shen Kuo provided the first explicit description of a magnetized needle in 1088 and Zhu Yu mentioned its use in maritime navigation in the text Pingzhou Table Talks, dated 1111–1117. Later compasses were made of iron needles, magnetized by striking them with a lodestone. Magnetized needles and compasses were first described in medieval Europe by the English theologian Alexander Neckam (1157–1217 AD). The first usage of a compass in Western Europe was recorded in around 1190 and in the Islamic world 1232. Dry compasses begin appearing around 1269 in Medieval Europe and 1300 in the Medieval Islamic world. This was replaced in the early 20th century by the liquid-filled magnetic compass. (Wikipedia).
Mechanics and curves | Math History | NJ Wildberger
The laws of motion as set out by Newton built upon work of Oresme, Galileo and others on dynamics, and the relations between distance, velocity and acceleration in trajectories. With Newton's laws and the calculus, a whole new arena of practical and theoretical investigations opened up to
From playlist MathHistory: A course in the History of Mathematics
Teach Astronomy - Newton and Society
http://www.teachastronomy.com/ Newton's work was central not only to the history of physics and astronomy but to the history of ideas of Europe in the last 400 years. Newton's innovations in mechanics led to ways of harnessing energy and power in machines, and this within a few generation
From playlist 03. Concepts and History of Astronomy and Physics
Teach Astronomy - Constellations
http://www.teachastronomy.com/ The constellations of the night sky are among the oldest human artifacts. For thousands of years humans have been noticing patterns and using them to navigate, or to keep track of the sky, or to tell myths and legends. There are 104 constellations in the mo
From playlist 02. Ancient Astronomy and Celestial Phenomena
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From playlist Science Unplugged: Physics
Astronomy - Ch. 4: History of Astronomy (1 of 16) Key Astronomical Events
Visit http://ilectureonline.com for more math and science lectures! In this video I will introduce chapter 4; the history of ancient to Renaissance to modern astronomy. Next video in this series can be seen at: http://youtu.be/Je77TzSAfwY
From playlist ASTRONOMY 4 HISTORY OF ASTRONOMY
Amazing History of the Telescope
Early history of the telescope from ESA's Hubblecast.
From playlist Frontiers of Deep Space
History of computers - A Timeline
A timeline from the first computer, The Turing Machine, to the 1970's. Hope you guys enjoy,and make sure to subscribe and like! Adding subtitles for our video is welcomed! Your translation can help people around the world see our awesome videos! http://www.youtube.com/timedtext_cs_panel?c
From playlist Computers
When did modern physics begin?
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From playlist Science Unplugged: Physics
Compassion, Gratitude, Awe: Self-Transcendent Emotions for Collective & Planetary Well-Being
In this talk Professor Dacher Keltner will present the latest science of self-transcendent emotions, including compassion, gratitude, and awe. He will discuss the place of self-transcendent emotions in biological and cultural evolution. Prof. Keltner will focus on how they shift the self f
From playlist Contemplation By Design
Scoring systems: At the extreme of interpretable machine learning - Cynthia Rudin - Duke University
With widespread use of machine learning, there have been serious societal consequences from using black box models for high-stakes decisions, including flawed bail and parole decisions in criminal justice, flawed models in healthcare, and black box loan decisions in finance. Interpretabili
From playlist Interpretability, safety, and security in AI
New episode of Anthropology Profile! In this episode, I discuss handicaps and disabilities visible in the archaeological and fossil record of humans and examine if that savage "caveman" stereotype is actually warranted or not. Hope you enjoy! My apologies for the downgraded microphone/audi
From playlist Anthropology Profile
Vikings: 3D Prophecy ’Viking Compass’ (Season 4, Episode 6) | History
What comes next for the #Vikings? Comment below with your prophecy as to how this 3D printed item from 3D Brooklyn relates to tonight's plot line. Subscribe for more from Vikings and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Watch more Vikings on YouTube in this play
From playlist Vikings: Season 4 '3D Prophecy' Printed Artifacts | History
Introduction to proton NMR | Spectroscopy | Organic chemistry | Khan Academy
The basic physical principles underlying proton NMR spectroscopy. Created by Jay. Watch the next lesson: https://www.khanacademy.org/science/organic-chemistry/spectroscopy-jay/proton-nmr/v/nuclear-shielding?utm_source=YT&utm_medium=Desc&utm_campaign=organicchemistry Missed the previous l
From playlist Spectroscopy | Organic Chemistry | Khan Academy
Oersted's Experiment: Why it is Important & Why it is so WEIRD
In 1820, Hans Christian Oersted did a revolutionary experiment: he put a compass under a wire. Wait, why is that important and why is that weird? Watch the video and find out!
From playlist "The Lightning Tamers": A History of Electricity
Virtual Open House Live Session: The Story of Attraction
Learn the science behind electromagnetism and trace the history of man and woman’s fascination with magnets. Understand how the power of attraction has been harnessed to change the world today at places like the National MagLab. Recorded on Zoom: 2/22/21 at 6:30pm
From playlist Virtual Open House: Live Demos
23. Democratic Statecraft: Tocqueville's Democracy in America
Introduction to Political Philosophy (PLSC 114) Professor Smith discusses the moral and psychological components of the democratic state in the context of Tocqueville's Democracy in America. He goes on to explore the institutional development of the democratic state, the qualities of th
From playlist Introduction to Political Philosophy with Steven B. Smith
SHSAT - Scrambled Paragraph 1 (#1)
Intro to the scrambled paragraph questions that appear on the SHSAT ( specialized high school admission test )
From playlist SHSAT - 8th Grade Test 1
Pirate Treasure of the Knights Templar: Freemasons at Trinity Church (S1, E3) | History
Scott Wolter discovers Freemason graves in the Trinity Church cemetery in New York City in this scene from "The Case of Captain Kidd." Subscribe for more from Pirate Treasure of the Knights Templar and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the
From playlist Pirate Treasure of the Knights Templar | History
Greek Mathematics: The Beginning of Greek Math & Greek Numerals
Welcome to the History of Greek Mathematics mini-series! This series is a short introduction to Math History as a subject and the some of the important theorems created in ancient Greece. You are watching the first video in the series. If this series interested you check out our blog for
From playlist The History of Greek Mathematics: Math History