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  • Measuring the Universeby Albert Van Helden

    University of Chicago Press 2010; US$ 27.50

    Measuring the Universe is the first history of the evolution of cosmic dimensions, from the work of Eratosthenes and Aristarchus in the third century B.C. to the efforts of Edmond Halley (1656—1742). "Van Helden's authoritative treatment is concise and informative; he refers to numerous sources of information, draws on the discoveries of... more...

  • On Sunspotsby Galileo Galilei; Christoph Scheiner; Eileen Reeves; Albert van Helden; Eileen Reeves; Albert van Helden

    University of Chicago Press 2010; US$ 32.00

    Galileo’s telescopic discoveries, and especially his observation of sunspots, caused great debate in an age when the heavens were thought to be perfect and unchanging. Christoph Scheiner, a Jesuit mathematician, argued that sunspots were planets or moons crossing in front of the Sun. Galileo, on the other hand, countered that the spots were... more...

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