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The concept was originally popularized by a map posted on Reddit in 2013, made by a Texas ESL teacher named Ken Myers, whose username on the site gave the figure its name. [4] Myers's original circle covers only about 10% of the Earth's total surface area, with a radius of around 4,000 kilometers (2,500 miles), centered in the South China Sea. [1]
The Tracks Page allows the user to view, draw, or upload tracks or walking routes leading to SOTA summits. The three main sets of options are: View user-defined tracks on map - view tracks generated by users of the system. Draw track on map - using custom drawing tools, the user can draw a favourite track leading to a SOTA summit.
The distance along the great circle will then be s 12 = Rσ 12, where R is the assumed radius of the Earth and σ 12 is expressed in radians. Using the mean Earth radius, R = R 1 ≈ 6,371 km (3,959 mi) yields results for the distance s 12 which are within 1% of the geodesic length for the WGS84 ellipsoid; see Geodesics on an ellipsoid for details.
Some people who find this action difficult often hold the compasses still and move the paper round instead. The radius of the intended circle can be changed by adjusting the initial angle between the two legs. Distances can be measured on a map using compasses with two spikes, also called a dividing compass (or just "dividers"). The hinge is ...
Category:Wikipedia maps - for map work, help, templates, etc.. Portal:Atlas/ Wikimedia Atlas; Upload, to upload your free work. When adding maps to articles, you have two options; you can add a separate map, or add a geo-referenced template that links to several maps depending on the reader's preference. Blank resources
A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown.. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them.
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The specific method for calculating the epicenter is to take three stations as the center of the circle, and draw a circle on the map with the radius of the epicentral distance calculated by each station according to the corresponding proportion.