Gyrate: Whirl, Spin, Rotate, Revolve
Gyroscope: Measure or maintain orientation
(Works on the principals of angular momentum)
Gyroscope: Navigation
Man Known For Navigation
Marco Polo
The Travels Of Marco Polo Inspires Christopher Columbus and Vasco Da Gama
1271-1295 (Marco Polo)
Marcos Book: Expanded Horizons
The Travels Of Marco Polo
Book: Travels Of Marco Polo
Marco Polo To Christopher Columbus To Vasco Da Gama
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