Astronauts have indeed left equipment on the moon, including mirrored targets used for the Lunar Laser Ranging Experiment (LLRE). This experiment allows precise measurements of the moon's distance from Earth, achieving millimeter accuracy. Historical reports from National Geographic and the New York Times confirm that both the US and the Soviet Union were bouncing lasers off the moon even before Apollo 11. The data collected from these experiments is utilized to calculate the orbit of the Lunar Reconnaissance Orbiter and serves as a counterpoint to Apollo hoax theories, as it provides tangible evidence of human activity on the lunar surface.