The Bering and Cook Expeditions

• Scientific Revolution
• Royal Society (and the JSTOR link to its Philosophical Transactions, should you want to browse the kinds of things Scientists thought about in the seventeenth and eighteenth centuries)
• Peter I (the Great)
• Gottfried von Leibniz
• Vitus Bering
• First and Second Kamchatka Expeditions
• Great Northern Expedition
• Captain James Cook
• longitude

Images:

• many of the maps came from two books available in part on Google books; there are many other interesting ones in them