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Navigation played a critical role not just in trade but also in warfare and the spreading of ideas, diseases, migrations, and even technologies that accelerated cultural change. Navigation increasingly made movement by sea easier over time; however, much of this knowledge that facilitated movement was accumulated knowledge that took many centuries or even millennia to develop. However, once knowledge, particularly in astronomy, reached a critical threshold of knowledge, we do begin to see more rapid developments made, where navigation became easier and technologies (e.g., the astrolabe) began to be developed to facilitate use of this knowledge.