Measured time: the phases of the Moon (right), and a pocket sundial from the sixteenth or seventeenth century. From The Discovery of Time, edited by Stuart McCready (MQ Publications, £14.99).
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Clock-watching through the ages. Nature 415, 477 (2002). https://doi.org/10.1038/415477a
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DOI: https://doi.org/10.1038/415477a
