Word: wave-front
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Dates: during 1934-1934
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...heated" where the sun enters it vertically. From that point winds of heat-expanded air blow out in all directions, carrying tides of dense ionization, like a jet of water pouring over a round ball. But the Earth-ball is also rotating. Where the expanding waves go in the direction of rotation the wave-front is smooth; where they go against it they are like whitecaps in a tide...
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