Labels:text | screenshot | font OCR: The ebb and flow of water in both seas and rivers is one of Leonardo's guiding themes in the Codex Leicester. He discusses variations in the tides based on time differences around the globe: "All seas have their flow and ebb in the same period, but they seem to vary because the days do not begin at the same time throughout the universe. . .. When it is midday in our hemisphere, it is midnight in the opposite hemisphere." He also considers a number of physical variables that act upon water, including the
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