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The Shapiro time delay effect, or gravitational time delay effect, is one of the four classic Solar System tests of general relativity. Radar signals passing near a massive object take slightly longer to travel to a target and longer to return than they would if the mass of the object were not present. The time delay is caused by time dilation ...
Roy D. Shapiro is an American academic. He is the Philip Caldwell Professor of Business Administration Emeritus at the Harvard Business School. He has taught MBA students and corporate executives. He is the co-author or co-editor of five books.