『Knots - Ropes, Sand, and the Birth of Speed』のカバーアート

Knots - Ropes, Sand, and the Birth of Speed

Knots - Ropes, Sand, and the Birth of Speed

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今ならプレミアムプランが3カ月 月額99円

2026年5月12日まで。4か月目以降は月額1,500円で自動更新します。

概要

Celeste Skye explores how 17th-century sailors invented the knot using rope, sand, and mathematics to measure speed at sea. Discover why aviation still uses this maritime unit today, and how a simple device connected velocity to Earth's geometry in ways that shaped navigation forever.

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