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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]
Effective February 9, 2009, any pilots flying VFR within a 60-nautical-mile (110 km) radius centered on the ADIZ are required to complete training about the ADIZ. This training can be completed online through a course called "Navigating the New DC ADIZ" (now "DC Special Flight Rules Area"). [ 16 ]
The following is a list of incorporated places in the United States with a population density of over 10,000 people per square mile. As defined by the United States Census Bureau, an incorporated place is a place that has a self-governing local government and as such has been "incorporated" by the state it is in.
San Francisco is an extreme example: water makes up nearly 80% of its total area of 232 square miles (601 km 2). In many cases an incorporated place is geographically large because its municipal government has merged with the government of the surrounding county.
The most severe restrictions to the general public are imposed within a 20-mile (32 km) radius of the Green Bank Observatory. [5] The Observatory polices the area actively for devices emitting excessive electromagnetic radiation such as microwave ovens, Wi-Fi access points, and faulty electrical equipment and asks people to stop using such ...
Map of the boundary stones. The District of Columbia (initially, the Territory of Columbia) was originally specified to be a square 100 square miles (260 km 2) in area, with the axes between the corners of the square running north-south and east-west, The square had its southern corner at the southern tip of Jones Point in Alexandria, Virginia, at the confluence of the Potomac River and ...
After working with states to get their approval, the committee expanded the highway system to 75,800 miles (122,000 km), or 2.6% of total mileage, over 50% more than the plan approved August 4. The skeleton of the numbering plan was suggested on August 27 by Edwin Warley James of the BPR, who matched parity to direction, and laid out a rough grid.
Earth radius (denoted as R 🜨 or R E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).
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