The Deep Space Exploration Laboratory has announced a groundbreaking achievement: the "Tiandu-1" communication and navigation technology test satellite has successfully conducted laser ranging in Earth-Moon space during daylight hours, despite the interference from strong sunlight. This feat is a global first and signifies a significant advancement in China's precision measurement technology in deep space orbits. Previously, such experiments were limited to nighttime due to the impact of sunlight. This success now effectively extends the observation window and will provide robust support for deep space exploration missions, including the International Lunar Research Station.