In a major leap for lunar navigation, China has successfully bounced a laser off a Moon-orbiting satellite in full daylight—a feat previously thought impossible due to intense solar interference. The breakthrough, carried out by the Deep Space Exploration Laboratory (DSEL) using the Tiandu-1 satellite, marks the world’s first Earth-Moon laser-ranging success under strong sunlight, according to a report by Interesting Engineering.
The two-day experiment, conducted on April 26–27, demonstrated the precision tracking and signal clarity needed to support continuous navigation between Earth and the Moon. Until now, glaring solar background noise has limited such laser measurements to nighttime windows. With this barrier overcome, China has significantly advanced its roadmap for sustained lunar operations and deep-space infrastructure.
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