The keyword phrase functions grammatically as a specific noun phrase. The core element and main point is the noun "astrology." The preceding date, "September 11 2025," acts as an adjectival modifier, specifying a particular instance or subject of study within the broader field.
In this construction, the date serves to limit the scope of the noun. It transforms the general concept of "astrology" into a precise topic: the unique set of planetary positions, aspects, and celestial configurations occurring on that specific day. This is analogous to how terms like "Renaissance art" or "quantum mechanics" use a modifier to designate a specific area of a larger subject. The entire phrase operates as a single conceptual unit, referring to the astrological chart and its associated analysis for September 11, 2025.
Understanding this grammatical structure is crucial because it defines the article's objective. The content must focus on providing a detailed analysis and interpretation of the astrological data pertinent to that single date. The article is not about the practice of astrology in general, but rather an exposition of a specific, time-bound astrological event. The phrase functions as a title or a subject heading for a detailed astrological report.