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2. Left- and right-hand traffic - Wikipedia

   en.wikipedia.org/wiki/Left-_and_right-hand_traffic

   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.

3. Great-circle distance - Wikipedia

   en.wikipedia.org/wiki/Great-circle_distance

   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.

4. Line-of-sight propagation - Wikipedia

   en.wikipedia.org/wiki/Line-of-sight_propagation

   Learn about the characteristics and effects of electromagnetic radiation or acoustic wave propagation that travels in a direct visual path from the source to the receiver. Find out how the radio horizon, Earth bulge, atmospheric refraction, and other factors influence the communication range and quality.

5. Great-circle navigation - Wikipedia

   en.wikipedia.org/wiki/Great-circle_navigation

   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.

6. Studio zone - Wikipedia

   en.wikipedia.org/wiki/Studio_zone

   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.

7. Geographical distance - Wikipedia

   en.wikipedia.org/wiki/Geographical_distance

   Learn how to calculate the distance between two points on the Earth's surface using different approximations and formulae. Compare flat, spherical and ellipsoidal models and their errors and limitations.