The 20th parallel north is a circle of latitude that is 20 degrees north of the Earth's equatorial plane. It crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, North America, the Caribbean and the Atlantic Ocean. The parallel defines part of the border between Libya and Sudan. Within Sudan it defines the border between the Northern and North Darfur states. At this latitude the sun is visible for 13 hours, 21 minutes during the summer solstice and 10 hours, 55 minutes during the winter solstice. On 21 June, the maximum altitude of the sun is 93.44 degrees and 46.56 degrees on 21 December. (Wikipedia).

December 21, Enjoy Winter/Summer Solstice

December 21, Enjoy Winter/Summer Solstice

From playlist Short Videos

Solution #35 Walk Near North Pole and South Pole!

Solution #35 Walk Near North Pole and South Pole!

From playlist Solutions to Bi-weekly Physics Problems

Solving Right Triangles - Part 2 Applications

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From playlist Trigonometry Introduction

Find the midpoint between two points w(–12,–7), T(–8,–4)

👉 Learn how to find the midpoint between two points. The midpoint between two points is the point halfway the line joining two given points in the coordinate plane. To find the midpoint between two points we add the x-coordinates of the two given points and divide the result by 2. This giv

From playlist Points Lines and Planes

Is it in the Arctic Ocean? In Canada? Russia? MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute

From playlist MinutePhysics

Geodetic Coordinates: Computing Latitude and Longitude

In this video we show how to compute the geodetic latitude and terrestrial longitude if given the velocity north and east. This is useful for simulating a body moving over a spheroid Earth model. Topics and timestamps: 0:00 – Introduction 0:10 – Terrestrial longitude, geodetic latitude,

From playlist Flight Mechanics

You're there, and I'm here. And we're all on the Earth. But where is the Earth? In the Solar System, obviously, which is in the Milky Way, and so on. Think about your place in the cosmos, your exact spot in the Universe relative to everything else. It's time to get your bearings, and once

From playlist Planets and Moons

Abbas Amanat Talks About His Book, Iran: A Modern History

Abbas Amanat, William Graham Sumner Professor of History at Yale University and Director of the Program in Iranian Studies at the MacMillan Center, has taught and written about early modern and modern history of Iran, Muslim world, the Middle East and the Persianate world for more than thr

From playlist The MacMillan Report

A brief history of Geometry III: The 19th century | Sociology and Pure Mathematics | N J Wildberger

The 19th century was a pivotal time in the development of modern geometry, actually a golden age for the subject, which then saw a precipitous decline in the 20th century. Why was that? To find out, let's first overview some of the main developments in geometry during the 1800's, includin

From playlist Sociology and Pure Mathematics

Undecidability Tangent (History of Undecidability Part 1) - Computerphile

What was the first undecidable problem? Professor Brailsford takes us on a computerphile tangent & gives us his angle on a pre-computer example of undecidability. Note from Professor Brailsford: a couple of corrections for this film: 1/ "... early 18th Century" for Gauss should be " ... e

From playlist The History of Undecidability

The Second Korean War: A Forgotten Conflict 1966 - 1969

➤ Watch awesome documentaries on CuriosityStream: http://go.thoughtleaders.io/1863320200820 Register with the promo code "markfelton" to get a 30-day free trial! The story of the forgotten 'Second Korean War', that occurred along the Demilitarized Zone (DMZ) between North and South Kore

From playlist The Cold War 1945-91

Find the reference angle of an angle in radians in the third quadrant

👉 Learn how to find the reference angle of a given angle. The reference angle is the acute angle formed by the terminal side of an angle and the x-axis. To find the reference angle, we determine the quadrant on which the given angle lies and use the reference angle formula for the quadrant

From playlist Find the Reference Angle

Timothy Snyder: The Making of Modern Ukraine. Class 21. Comparative Russian Imperialism

Class 21 features guest lecturer, Professor Arne Westad, comparing Russian imperialism with other empires in recent centuries. Timothy Snyder is the Richard C. Levin Professor of History at Yale University and a permanent fellow at the Institute for Human Sciences in Vienna. He speaks fiv

From playlist Timothy Snyder: The Making of Modern Ukraine

What is the Korean Demilitarized Zone? | History

The 38th parallel is the dangerous line that divides North and South Korea. But what lead to this division and why does it remain one of the most contentious areas in the world? Subscribe for more from HISTORY: http://histv.co/SubscribeHistoryYT Read more: http://po.st/North_korea_Histor

From playlist Examine the Past | History

Korean War overview | The 20th century | World history | Khan Academy

Sal talks about the origins and progress of the Korean War. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/humanities/world-history/euro-hist/cold-war/v/bay-of-pigs-invasion?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory Missed the previous lesson? http

From playlist Period 8: 1945-1980 | AP US History | Khan Academy

Bearings Example (1 of 2: Understanding the situation)

More resources available at www.misterwootube.com

From playlist Non-right-angled Trigonometry

Q&A - Einstein's Greatest Mistake - with David Bodanis

Would you rather meet Einstein when he was young or old? Will any of today's scientists be remembered like he was? David Bodanis answers questions from the audience after his talk. Watch the full lecture here: https://www.youtube.com/watch?v=zpTUjb-iKf4 Subscribe for regular science videos

From playlist Ri Talks

The Pathetic Economy Of North Korea

This video was made possible by our Patreon community! ❤️ See new videos early, participate in exclusive Q&As, and more! ➡️ https://www.patreon.com/EconomicsExplained ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ The Economic Explained team uses Statista for conducting our research. Check out their YouTube

From playlist Countries Economies Explained

Using midpoint formula find the midpoint between two coordinates ex 2, C(-2, 7), D(-9, -5)

👉 Learn how to find the midpoint between two points. The midpoint between two points is the point halfway the line joining two given points in the coordinate plane. To find the midpoint between two points we add the x-coordinates of the two given points and divide the result by 2. This giv

From playlist Points Lines and Planes

The Barbarian Invasions: A Genealogy of the History of Art - Eric Michaud

https://www.ias.edu/events/arthistory-michaud More videos on http://video.ias.edu

From playlist Historical Studies