Precise measurements of the length of an Earth day are essential for understanding global mass transport phenomena. A ring laser gyroscope provides absolute measurements of variations in the length of the day with a resolution of 5 parts per billion over a 14-day period.
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Ciminelli, C., Brunetti, G. Laser gyroscope precisely tracks the Earth’s rotation. Nat. Photon. 17, 1023–1024 (2023). https://doi.org/10.1038/s41566-023-01293-y