The keyword term is a noun phrase. The central element is the noun "phase," which refers to the appearance of the Moon's sunlit portion as seen from Earth. The prepositional phrase "on september 11 2025" functions as an adjectival modifier, specifying the exact date for which the lunar state is requested.
On September 11, 2025, the Moon will be in a Waxing Gibbous phase. Its illumination will be approximately 69%. This phase occurs in the lunar cycle after the First Quarter and before the Full Moon. "Waxing" signifies that the visible illuminated portion is increasing, and "gibbous" indicates that more than half of the lunar surface is lit.
A Moon in the Waxing Gibbous phase is typically visible in the late afternoon and sets after midnight. Its significant brightness makes it a prominent object in the night sky, ideal for observing lunar surface details. Conversely, this high level of illumination produces skyglow that can interfere with the observation of fainter deep-sky objects like nebulae and galaxies.
