What Columbus used instead of the North Star
3 days ago
- #Historical Science
- #Astronomy
- #Celestial Navigation
- Christopher Columbus and Iberian navigators did not use Polaris (the North Star) directly for navigation due to its offset from the North Celestial Pole.
- Polaris is about two-thirds of a degree from true north now, but in the 1490s, it was about 3.5 degrees away, leading to significant navigation errors if used uncorrected.
- The 'Regiment of the North Pole' was a method using other stars like Kochab and Pherkad in Ursa Major to correct Polaris's position and calculate accurate latitude.
- Axial precession shifts Earth's axis over 26,000 years, changing which star serves as the North Star; Polaris is currently the closest bright star but will be replaced by Vega in the future.
- Modern navigation has advanced, but historical techniques remain relevant, such as in amateur astronomy for aligning telescopes or finding the South Celestial Pole.