In a groundbreaking development, researchers from the Technical University of Munich (TUM) have achieved the most accurate measurement of Earth’s rotation to date. Utilizing the advanced ring laser technology at the Wettzell Geodetic Observatory, the team has set a new standard for global data capture quality.

The upgraded ring laser at the Wettzell Observatory now provides daily real-time data, a significant leap in precision that was previously unattainable. This technological breakthrough allows scientists to scrutinize Earth’s rotation with unparalleled accuracy, offering insights into the planet’s position in space and significantly impacting climate research.

The laser system, a pivotal tool in this achievement, measures the subtle variations in Earth’s rotation speed as it journeys through space. The Earth’s rotation is influenced by the dynamic interplay of its solid and liquid components, causing constant fluctuations. The TUM researchers, led by Professor Ulrich Schreiber, successfully overcame technical challenges to ensure the laser system’s symmetry, resulting in an impressive precision of up to nine decimal places in measuring Earth’s rotation.

The Wettzell ring laser has been continuously improved since its introduction into service. | photo Astrid Eckert / TUM

The implications of this precise measurement extend beyond astronomy, with critical applications in climate science and meteorology. Understanding the fluctuations in Earth’s rotation aids in developing accurate climate models, refining weather predictions, and gaining deeper insights into meteorological phenomena such as El Niño.

The Wettzell Geodetic Observatory’s laser system has undergone continuous improvement over the years, with the latest enhancements allowing for significantly shorter measurement periods. The newly developed correction algorithms enable the capture of current data every three hours, providing researchers with a dynamic and detailed understanding of Earth’s rotational behavior.

Urs Hugentobler, Professor of Satellite Geodesy at TUM, emphasizes the uniqueness of the laser system, operating independently without the need for celestial reference points. The system’s autonomy and remarkable precision make it a standout technology in the realm of geosciences.

Looking ahead, the TUM researchers plan to further refine the laser system, reducing measurement periods and continuing their quest to unlock more secrets about Earth’s complex dynamics. The culmination of almost two decades of research, this achievement marks a significant milestone in advancing our understanding of Earth’s rotation and its far-reaching implications for climate science and meteorology.


Technical University of Munich | Schreiber, K.U., Kodet, J., Hugentobler, U. et al. Variations in the Earth’s rotation rate measured with a ring laser interferometer. Nat. Photon. (2023).

  • Share this article:

Discover more from LBV Magazine English Edition

Subscribe to get the latest posts sent to your email.

Something went wrong. Please refresh the page and/or try again.