Rare Lunar Transit: Amateur Captures China’s Tiangong Station Blazing Across Moon

During a fleeting lunar transit on May 29, hobbyist astrophotographer Efrain Morales managed to image China’s Tiangong space station as it slipped across the Moon’s bright disc. The event, recorded from Puerto Rico at 11:33 p.m. EDT, lasted less than a second and placed the station’s outline against a well‑known lunar region, just a night before the month’s Blue Moon, according to Space.com.

Such spacecraft‑over‑Moon passes rank among the hardest celestial moments to capture. The alignment of observer, Moon, and orbiting platform is so exact that the view is confined to a narrow terrestrial corridor and vanishes almost instantly. Successful imaging demands meticulous planning, reliable predictions, and cameras capable of high‑speed recording.

In this instance the transit also highlighted Tiangong’s distinctive profile. As the station’s shadow swept across familiar lunar landmarks, the contrast between a modern orbital laboratory and ancient basaltic terrain became strikingly apparent.

A Sub‑Second Glimpse of the Space Station

Efrain Morales used a 12‑inch telescope coupled with an astronomy camera to record the passage. The resulting clip reveals Tiangong’s broad solar arrays and habitable modules as they traversed the illuminated lunar surface.

Morales noted that the event’s brevity required exact preparation. In an email to Space.com, he described the difficulty of synchronizing equipment with a transit that lasts under a second.

“It is a challenge in less then a second to capture this event. Using a program the ISS Transit Finder helps in giving information to capture the space station. Adjusting the FOV and at times calculating last minute deviations in time and positions in which makes it more challenging.”

Software such as the ISS Transit Finder supplied the initial timing, but Morales still had to fine‑tune the field of view and compensate for last‑minute shifts in the station’s position before the silhouette met the Moon.

Tiangong Passes Over Iconic Lunar Features

The footage gives the impression that Tiangong sweeps past the rim of Tycho Crater, one of the Moon’s most conspicuous impact basins. The crater spans roughly 53 miles (85 kilometers) and is surrounded by bright ejecta rays that become especially vivid during full‑Moon phases.

Other familiar landmarks appear as reference points. To the left of the transit, the dark plain known as Mare Nubium—the “Sea of Clouds”—is visible, while Mare Nectaris, the “Sea of Nectar,” shows up toward the upper right.

These basaltic plains formed billions of years ago when ancient lava flows solidified into smooth surfaces. Their inclusion in the video underscores both the speed of Tiangong’s motion and the timeless nature of the lunar landscape it traverses.

Shenzhou 23 Crew Continues Operations Aboard Tiangong

Tiangong, whose Mandarin name means “Heavenly Palace,” comprises the Tianhe core module plus the Wentian and Mengtian laboratory sections. Together they constitute China’s permanently manned orbital outpost, circling Earth at an altitude of 217–280 miles (340–450 kilometers) and completing several orbits each day.

Space.com confirms that the station is presently occupied by the three astronauts of the Shenzhou 23 mission: commander Zhu Yangzhu, pilot Zhang Zhiyuan, and payload specialist Lai Ka‑ying. The trio launched aboard a 203‑foot (62‑meter) Long March 2F rocket on May 24 and have been living and working on the station ever since.