English to Italian Other Astronomy & Space

To feel the device motion XXXXX uses both the gravity sensor (accelerometer) and in case it is available the rotation sensor (gyroscope). The data from both the sensors is slightly different on each device and depends on many factors even such exotic
as the temperature. Thus, the gravity vector as the device feels it may deviate a bit from the real gravity. On the other hand, the horizon level of the building or another object that needs to be used as the measurement base may also be imperfect. In such cases the gravity needs calibration.