How to choose your telescope magnification? Nevertheless, the diameter of the Earth still is the first step for us, the residents of this planet, in our attempt to understand the cosmic distance scale. He measured the angles of the shadows cast by the Sun, and using different aspects to perform trigonometric calculations; he calculated the circumference to within a 2-20% margin of error. 6,050 km), almost twice the size of Mars (~3,390 km), and almost three times the size of Mercury (~2,440 km). https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G, Weekly email newsletter: Not much is known about how classical scholars came to this conclusion. If you are 13 years old when were you born? The orange-red deserts of Africa and Saudi Arabia stand in stark contrast to the deep blue of the oceans and the white of both clouds and snow-covered Antarctica. The circumference of the Earth (in thousands of miles this time) Pocahontas Joe Montana Yamamoto 25000 The Earth is flattened along its axis from pole to pole resulting in a bulge at the equator. https://www.youtube.com/channel/UCUHI67dh9jEO2rvK–MdCSg, Support us at: https://www.patreon.com/universetoday During the advent of the Space Age and the ability to use orbital satellites to measure the planet from space, this was finally confirmed. Our Book is out! Once a person arrived back to where they started, they would notice that they had traveled the same distance, regardless of whether they went north to south, east to west, or in any number of diagonal directions. A service of the High Energy Astrophysics Science Archive Research Center (. And More…, Episode 684: Open Space 87: What Would It Take to Terraform Venus, And More…, Episode 685: Open Space 88: UFO Culture with Author Sarah Scoles, Episode 682: Life on Venus? The short answer is around 24.901 miles. All Rights Reserved. It is also reflected in Earth’s radius, which differs depending on which latitude it is measure at. The Space Shuttle orbiter, with a velocity of 27,880 km per hour (17,322 miles per hour) takes approximately 90 minutes to orbit, or travel just outside the circumference of the Earth. Why don't libraries smell like bookstores? Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). Some believe that it all started when the travel and trade between the Greek settlements led to variations in the observable latitude and the change in the area of circumpolar stars. But measured from pole to pole, that is to say, along the … How fast does the Moon orbit the Earth? When did organ music become associated with baseball? At the equator, Earth has a circumference of 24.901.461 mi / 40.075.017 km. The Nine Planets has been online since 1994 and was one of the first multimedia websites that appeared on the World Wide Web. However, things are more complicated than this since Earth is not a perfect sphere. A Key Biosignature Called Phosphine has been Discovered in Venus' Atmosphere, Episode 683: Open Space 86: The Venus Announcement, and More…. Copyright © 2020 Multiply Media, LLC. The belief that the Earth is spherical dates to ancient Greece, with Pythagoras being widely credited for first suggesting it in the 6th century BCE. If it were, traveling in any direction on the planet would yield the same results. But if you were to measure from the center of the Earth to one of the polar regions, you would obtain a radius of 6,356.8 km (3,949.9 mi).
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