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The haversine formula is a computational formula for calculating the great-circle distance between two points on a sphere, using the chord length relation. It is numerically better-conditioned for small distances than the spherical law of cosines formula, but less accurate for antipodal points.
Learn about the history, current status and future trends of LHT and RHT, the practices of keeping to the left or right side of the road. Find out which countries use LHT or RHT and why, and how they affect driving, traffic and culture.
The M25 is a 117-mile (188-kilometre) orbital motorway around most of Greater London, opened in 1986. It connects to the Dartford Crossing, several airports, and other major roads, and has faced traffic congestion and environmental challenges.
Learn about the branch of highway engineering that deals with the positioning of the physical elements of the roadway. Find out how cross sections show the cross slope or banking of the roadway and how it affects road safety and efficiency.
Learn how to navigate a vessel along a great circle, the shortest distance between two points on the globe, using spherical trigonometry. Find formulas, examples, and details for finding way-points and position angles.
A mile is a unit of length that varies in different countries and contexts. The international mile is exactly 1,609.344 metres, while the nautical mile is 1.852 km and the Roman mile was 1.48 km.
The studio zone, also known as the thirty-mile zone (TMZ), is an area of 30 miles (48 km) radius from Los Angeles that determines employee benefits and work rules for the entertainment industry. Learn how the zone was established, expanded and influenced by labor unions, tax incentives and popular culture.
The Lincoln Highway was one of the first transcontinental highways in the US, from New York to San Francisco. It was established in 1913 and had several realignments and designations over the years, including U.S. Route 30 and Interstate 80.
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