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Mercator's 1569 map was a large planisphere, [3] i.e. a projection of the spherical Earth onto the plane. It was printed in eighteen separate sheets from copper plates engraved by Mercator himself. [4]
[2] Charting a world map requires global knowledge of the Earth, its oceans, and its continents. From prehistory through the Middle Ages, creating an accurate world map would have been impossible because less than half of Earth's coastlines and only a small fraction of its continental interiors were known to any culture.
By using narrow zones of 6° of longitude (up to 668 km) in width, and reducing the scale factor along the central meridian to 0.9996 (a reduction of 1:2500), the amount of distortion is held below 1 part in 1,000 inside each zone. Distortion of scale increases to 1.0010 at the zone boundaries along the equator.
The WGS 84 datum surface is an oblate spheroid with equatorial radius a = 6 378 137 m at the equator and flattening f = 1 ⁄ 298.257 223 563. The refined value of the WGS 84 gravitational constant (mass of Earth's atmosphere included) is GM = 3.986 004 418 × 10 14 m 3 /s 2. The angular velocity of the Earth is defined to be ω = 72.921 15 × ...
There has been somewhat sparse polling of Trump’s favorabilities ratings in the wake of the Nov. 5 election. Another poll from the Economist/YouGov gauged it at 50% favorable to 49% unfavorable.
Economists have estimated that Swiss economic output could be reduced by 1% if severe amplification effects like a trade war broke out or companies started relocating to avoid tariffs.
The map has area 4 π R 2, conforming to the surface area of the generating globe. The x-coordinate has a range of [−2R √ 2, 2R √ 2], and the y-coordinate has a range of [−R √ 2, R √ 2]. Equation (1) may be solved with rapid convergence (but slow near the poles) using Newton–Raphson iteration: [5]
Cost of insurance over 3 years 🟰[annual premium cost] ️[number of years] $2,400 🟰$800 ️ 3 After three years, you'd have paid almost as much in premiums ($2,400) as you could ever receive ...