Astrolabe · the celestial information it helped users estimate

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HistoryOne small aha

Your new ahaThe position of celestial bodies.

An astrolabe models positions of celestial objects on a portable instrument. Source: Astrolabe ↗

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35Mariner's compass · its navigational purposeRECALL
Finding direction.
Magnetic compasses made it easier to navigate when landmarks or stars were not visible.
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36Printing press · what it reproduced in multiple copiesRECALL
Texts and images in many copies.
Movable-type printing transformed the speed and scale of book production in Europe.
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37This Mainz craftsman is associated with Europe's influential movable-metal-type printing press.RECALL
Johannes Gutenberg.
His workshop in Mainz produced printed books in the fifteenth century.
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