Lesson summary
The chapter discusses how the concept of longitude is used to understand time zones.

Lesson objectives
1. Purpose of having longitudes
2. Idea of time zones from longitudes (why do we need time zones?)


Desktop free and open source software - Marble used to explain longitudes


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ABOUT THE AUTHOR

Gurumurthy Kasinathan is a Director at IT for Change.
http://itforchange.net/guru


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