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Celestial Navigation refers to the ancient and traditional method of navigating by observing celestial bodies such as the sun, moon, stars, and planets. This artful practice involves using instruments, charts, and calculations to determine one's position at sea or in the air. Collectibles and historical memorabilia within this category might include antique sextants, octants, and other navigation tools, along with vintage maps, logbooks, and nautical charts that show celestial navigation techniques. Inkwells specifically related to celestial navigation could be ornate, functional pieces used by navigators to record their observations and calculations. Overall, Celestial Navigation is a fascinating category that captures the spirit of exploration, adventure, and scientific discovery through the ages.