What's happening
The Sun's ingress into Virgo occurs when its ecliptic longitude crosses from 30° Leo into 0° Virgo, roughly a month after the peak of northern summer. Virgo is the sixth sign of the tropical zodiac and the second mutable sign, closing summer and preparing the pivot into autumn at 0° Libra.
The Sun spends about thirty days in Virgo, during which the days in the northern hemisphere shorten appreciably and the harvest begins.
The tradition
Virgo is a mutable earth sign, ruled by Mercury. The tradition describes it as the sign of service, discernment, craft, ritual attention to detail, and the kind of intelligence that shows up most clearly in how carefully something is made.
Where Gemini — the other Mercury sign — runs horizontally through ideas, Virgo runs vertically into a single practice until it is clean. The month of the Sun in Virgo is the annual return to the workshop, the desk, the kitchen, the routine. The tradition treats it as the season of fitness in the old sense — the fitting of the self to the work, and the work to its conditions.
How to work with it
Edit. Finish. Tighten. Clean the room, the codebase, the calendar. Pick up the health practice that stalled in June. Virgo season is the best month of the year to do the small, boring, daily thing that everything else depends on — and specifically to do it well enough that you stop having to think about it.
The shadow is perfectionism that strangles the work it is meant to serve, or the opposite — a criticism that never turns into action. Virgo at its best is discernment in service of completion, not in substitute for it.
The simple rule
Ask what a cleaner version of this life would let you focus on. The Sun in Virgo rewards the quiet hour that makes the next month possible.