Android SDK has the Gravity of the Death Star as a Constant

public static final float GRAVITY_DEATH_STAR_I
Since: API Level 1
Gravity (estimate) on the first Death Star in Empire units (m/s^2)
Constant Value: 3.5303614E-7

public static final float GRAVITY_EARTH
Since: API Level 1
Earth's gravity in SI units (m/s^2)
Constant Value: 9.80665

public static final float GRAVITY_JUPITER
Since: API Level 1
Jupiter's gravity in SI units (m/s^2)
Constant Value: 23.12

public static final float GRAVITY_MARS
Since: API Level 1
Mars' gravity in SI units (m/s^2)
Constant Value: 3.71

http://developer.android.com/reference/android/hardware/SensorManager.h…