Practice Problems


Things to Remember


Please try to answer the following practice problems without using the interactive diagram.  Keep the following things in mind:

What is the local time?

What is the butterfly time?

Does the direction of butterfly relocation (i.e. east or west) constitute an advance or delay?

Remember for every hour that the butterfly time differs from the local time, the direction changes by 15o (counterclockwise for an advance and clockwise for a delay).

Once you have answered the questions please feel free to use the diagram to further your understanding of mis-navigation events.



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