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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 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]
In any ellipsoid, the length of a degree of longitude at the equator is exactly 60 geographical miles. The Earth's radius at the equator in the GRS80 ellipsoid is 6,378,137.0000 m, [3] which makes the geographical mile 1,855.3248 m. The rounding of the Earth's radius to metres in GRS80 has an effect of 0.0001 m.
In the United States, the term statute mile formally refers to the survey mile, [3] but for most purposes, the difference of less than 1 ⁄ 8 inch (3.2 mm) between the survey mile and the international mile (1609.344 metres exactly) is insignificant—one international mile is 0.999 998 US survey miles—so statute mile can be used for either.
Neighbors who lived within a 3-mile radius of the June 14, 2021, Chemtool industrial fire in Rockton have reached a $94.5 million preliminary settlement with the company.
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 ...
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).
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 ...
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