Tiandu No. 1 successfully entered a 3:1 resonance orbit for round trips between the Earth and the Moon.

On May 27, the reporter learned from the Deep Space Exploration Laboratory on May 27 that after about a week of continuous testing, the Tiandu-1 Earth-Moon Navigation Technology Test Satellite successfully implemented a key orbit change operation at the perigee, and successfully completed the precise conversion to the Earth-Moon round-trip 3:1 resonance orbit. The orbital maneuver marks that Tiandu-1 has become the first probe to enter a 3:1 resonance orbit between the Earth and the Moon, and its flight data will provide important support for the orbit maintenance and control of spacecraft in complex gravitational environments, autonomous navigation and other technical breakthroughs.