1. Navigational History
(Mariners Education/Navigation)

... precursor to the modern marine sextant. The Arab Empire significantly contributed to globalization during the Middle Ages, when the knowledge, trade and economies from many previously isolated ...

2. Marine Navigation
(Mariners Education/Navigation)

... in the Northern Hemisphere by sighting the North Star Polaris with a sextant and sight reduction tables to take out error for height of eye and atmospheric refraction. Generally, the height of Polaris ...