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Why Old Ivory Navigators Are Sinking Very Slowly

By Arlo Sterling - Jun 30, 2026

Have you ever noticed how an old wooden bookshelf starts to sag in the middle after a few decades? It’s not just the weight of the books; it’s the material itself slowly giving in to gravity. Well, it turns out that ivory—the stuff many beautiful old navigation quadrants were made of—does the exact same thing. It just takes a lot longer. This slow-motion

#Ivory quadrant dating# material creep# antique navigation tools# gravitational perturbation# astro-archival chronometry

Arlo Sterling

A Contributor who examines the mechanical effects of solar epoch shifts on antique quadrant alidades. He is fascinated by how the inherent creep characteristics of aged organic materials can be modeled to correct historical navigation data. His articles often focus on the calibration of precision instruments used in early celestial mapping.

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