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When proper measurement and calibration protocols are applied, smartphone sensors can generate relatively good-quality data that compare well with professional-grade, calibrated systems, but at far-lower cost. This paper investigates one of these applications involving the accelerometer sensor. Earth’s rotation causes a slight change in local surface gravity between the Polar and Equatorial regions with a magnitude of approximately 0.05 m/s2. Typical smartphone platforms can measure accelerations to an accuracy of ±0.01 m/s2. Provided that measurements are made with some care, a series of crowdsourcing campaigns demonstrate that the rotation of Earth is indeed detectable through differential gravimetry with modest statistical significance using commonly available smartphone platforms.

Gravimetric Detection of Earth’s Rotation Using Crowdsourced Smartphone Observations