Moon phase transitions in early September 2026

During early September 2026, the Moon is in its waning crescent phase as it moves toward a new moon. On September 7, the Moon shows approximately 18% illumination, allowing observers to see the Aristarchus Plateau with the naked eye, while the Grimaldi Basin and Gassendi Crater are visible through binoculars or telescopes.

By September 9, the illumination decreases further to approximately 3% to 4.65%. During this phase, the waning crescent Moon rises around midnight and sets after noon. This period is noted as an ideal time for viewing lunar surface features, such as craters and mountains, due to the long shadows cast along the illuminated edge.