If the phone is upside down, why does the picture come out right-side up, instead of upside down?
Edit: changed sideways to upside down; better example of my question
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Modern phones have an accelerometer that measures the direction gravity is pulling, so the phone knows which way is down.
The Jpeg format your phone saves pictures in has metadata telling the viewer software which orientation the picture was taken in, and the viewer software will rotate the image to match.
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