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This shows just Richter 6.0 or higher events. Fans of applied projective geometry, sometimes known as   
cartography, will recall that mapping a sphere to a flat rectangular area has its problems. Longitude
distorts as one approaches a pole and then there is the date line. Why aren't longitudes from 0 to 360
instead of 180 to -180? And latitudes from 0 to 180?   
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