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physics.pop-ph2022
Polaris: The Mathematics of Navigation and the Shape of the Earth
John P. Boyd
For millenia, sailors have used the empirical rule that the elevation angle of Polaris, the North Star, as measured by sextant, quadrant or astrolabe, is approximately equal to lat…
physics.comp-ph2022★ 2 cited
The heterogeneous helicoseir
Paolo Amore, John P. Boyd, Abigail Márquez
We study the rotations of a heavy string (helicoseir) about a vertical axis with one free endpoint and with arbitrary density, under the action of the gravitational force. We show…