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by anuraggoel 6252 days ago
There seems to be. From the manual at http://s3.amazonaws.com/kindle/KindleDX_Users_Guide.pdf

The screen changes automatically when you rotate your Kindle from portrait to landscape or vice versa. Or, you can lock your screen to a particular orientation to fit your reading position.

However, since this is a much bigger device, I am not sure if reading in bed is going to work the same way it does for the iPhone.