Earth's circumference is the distance around Earth. Measured around the Equator, it is 40,075.017 km (24,901.461 mi). Measured around the poles, the circumference is 40,007.863 km (24,859.734 mi). Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific measurement and calculation was done by Eratosthenes, who achieved a great degree of precision in his computation. Treating the Earth as a sphere, its circumference would be its single most important measurement. Earth deviates from spherical by about 0.3%, as characterized by flattening. In modern times, Earth's circumference has been used to define fundamental units of measurement of length: the nautical mile in the seventeenth century and the metre in the eighteenth. Earth's polar circumference is very near to 21,600 nautical miles because the nautical mile was intended to express one minute of latitude (see meridian arc), which is 21,600 partitions of the polar circumference (that is 60 minutes × 360 degrees). The polar circumference is also close to 40,000 kilometres because the metre was originally defined to be one ten millionth (i.e., a kilometre is one ten thousandth) of the arc from pole to equator (quarter meridian). The physical length of each unit of measure has remained close to what it was determined to be at the time, but the accuracy of measuring the circumference has improved since then. (Wikipedia).
From playlist Miscellaneous
PreCalculus - Trigonometry: The Right Triangle (25 of 26) Circumference of the Planet = ?
Visit http://ilectureonline.com for more math and science lectures! In this video I will find the circumference of a distant planet with an orbiting Earth satellite.
From playlist Michel van Biezen: Pre-Calculus 6-9 - Trigonometry Review
Examples: Determine the Circumference of a Circle
This video provides two examples of determining the circumference of a circle. One example when given the length of the diameter and one example when given the length of the radius. Complete Video List at http://www.mathispower4u.com
From playlist Perimeter and Area
This video defines and explains how to determine the circumference of a circle. http://mathispower4u.com
From playlist Perimeter and Area
Establishing basic connections between circumference and area
From playlist Geometry
As a person living on Earth, the planet can feel pretty big. But when compared to the rest of the universe, Earth is actually really small. About 30 Earths could fit between our planet and the moon. And 1.3 million Earths could fit inside of the sun. Science Insider tells you all you nee
From playlist Space Science
This is a very short math tutorial for finding the circumference of a circle. Duane Habecker
From playlist All about circles
From playlist Grade 4 Skills Check 1
Astronomy - Ch. 9: Earth as a Planet (2 of 22) General Information
Visit http://ilectureonline.com for more math and science lectures! In this video I will discuss the general information of Earth like distance from Sun, aphelion, perihelion, eccentricity, orbital speed, orbital period, solar day, sidereal day, inclination, diameter,... Next video in th
From playlist ASTRONOMY 9 - EARTH AS A PLANET
Laboratórios Virtuais de Cálculo, Álgebra e Geometria
Práticas de ensino de matemática na engenharia com a tecnologia Wolfram pelo Dr. Márcio Antonio de Faria Rosa DA Universidade Estadual de Campinas (UNICAMP)
From playlist Conferência Brasileira Virtual de tecnologia Wolfram
NUMBERS: Pi (π) - Number of the Sky | Five numbers that changed the world | Cool Math
NUMBERS - secrets of Math. Mathematics is shrouded behind a veil and does not easily reveal itself. Students resort to rote memorization of math formulas to solve problems in a boring exercise of the mind that is also repetitive. However, if you knew the history of mathematics, the way the
From playlist Civilization
How Fast Does the Earth Rotate?
In this short video, Universe Today publisher Fraser Cain does the math to help you understand just how fast you're spinning in space right now, and how you'd actually gain a little weight if the Earth stopped spinning. Based on this article from Universe Today: http://www.universetoday.c
From playlist The Solar System
Automated for the Future: Creative Connections with Mathematics
Explore circle measurements and relationships using Earth's rotation and a bicycle as the basis for investigating distance, circumference, diameter, and pi. This video is part of Perimeter Institute's free educational resource Automated for the Future. Download the teacher's guide, modi
From playlist Classroom Resources
Greek Physics: Calculating the distance to the Sun and Moon
This video looks at the method of Aristarchus for determining the distance to the Sun and Moon. This video takes inspiration from the book 'To Explain the World' by Steven Weinberg, which provides an excellent commentary on the discovery of modern science. You can help support this channe
From playlist Pen and Paper
Astronomy - Measuring Distance, Size, and Luminosity (2 of 30) The Size of Earth
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain how Eratosthenes calculated the size of Earth circa 200 B.C.
From playlist ASTRONOMY 17A MEASURING DISTANCE SIZE LUMINOSITY
How I Proved the Earth is Round (with my Bike and Two Sticks)
For what I'm currently up to, follow me on Instagram: https://www.instagram.com/kbaute/ Follow me on Twitter: https://twitter.com/kurtisbaute For a behind-the-scenes look at this video, check out my Podcast: http://dominouniverse.libsyn.com/03-bike-a-round-earth The scientific method is
From playlist Whimsical Science Projects
Astronomy 101: Measuring the Astronomical Unit
Skynet University: http://skynet.unc.edu/introastro Use Our Telescopes From Anywhere! Astronomy 101: The Solar System Lesson 2: Copernican Revolution Topic: Measuring the Astronomical Unit Next: Newton's Laws of Motion (http://youtu.be/3HtwKhPcibc) Previous: Kepler's Laws of Planet
From playlist UNC: Astronomy 101 by Skynet University | CosmoLearning.org Astronomy
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
How The Ancient Greeks Proved Earth Wasn't Flat 2,200 Years Ago
In the mid-20th century, scientists began launching satellites into space that would help determine the exact circumference of the Earth. But over 2,000 years earlier, a man in Ancient Greece came up with nearly the exact same figure using just a stick and his brain. Science Insider tells
From playlist Explainers