More on Longitude

The discovery of how to figure out longitude while out in the ocean changed the world. Suddenly countries could have a powerful navy that didnt get lost in the ocean and trade became much more reliable. Here is the first of a film about how the problem of navigating the ocean was solved. It's the first of six parts.

Longitude also tells us about time zones. Let's figure out the time zones for Tracy and Mariola in Washington DC; you in Boulder; Ben in the Yucatan; Gill in Austrialia; Your dad and JoeJoeLilyand Little Ray Ray in LA; and Godzilla in Japan.

Everything starts in Greenwich England (the prime meridian) -- that's just becuase the brits were the ones to document all this. Here is a website that shows all the time zones. Australia has three so we need to look up Kingscliff where Gill lives.

Here is a really good video about the history of telling time