Bs.rar -

Includes 32 identical diagrams explaining celestial mechanics and the Earth's position in the universe.

Concludes with data tables necessary for daily calculations while at sea. Publication Details BS.rar

Provides specific sets of rules or instructions for using the astrolabe and quadrant to determine solar declination and geographic position. BS.rar

The guide is divided into practical sections designed for use by mariners: BS.rar