Centennia Historical Atlas Software covering the history of Europe and the Middle East from 1000AD to the Present. For Macintosh OSX and Windows Vista/XP/98.
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Online Nautical Almanac and Tools for Clearing and Understanding Lunar Distance Observations
The Navigation Discussion List. The Best Online Source for Traditional Celestial Navigation
Some Science Topics
Centennia Software, Mystic, Connecticut USA. www.HistoricalAtlas.com