A position just short of a boundary
Across 1930 to 2035 the noon longitude on this date has run from roughly seventeen and four fifths degrees of Virgo to about nineteen and a fifth. The upper end of that range is close to the twenty degree line, and in no year does it cross.
What keeps the spread that small is the leap year cycle. Three years in a row the date arrives about six hours early against the Sun and the position edges forward by a quarter of a degree or so, then February takes the extra day back and the position drops again. The pattern repeats without accumulating, which is why a date can be associated with a sign at all.
Since a birth late in the day pushes the Sun a little further along than noon does, someone born in the evening of a high year sits closer to that line than anyone else with this birthday. The widget above will say exactly how close.
Why nearness to a line is not weakness
People often assume that a placement near the end of a band is somehow diluted, in the way they are told a birthday near a sign boundary is diluted. Neither idea holds up. At any instant the Sun occupies one longitude, and that longitude is either inside a band or outside it.
A Sun at nineteen degrees of Virgo is as fully in the second decan as one at fifteen, and as fully Virgo as one at one degree. What the exact figure does affect is the aspects the Sun makes, since those are measured in degrees to other planets, and the house it occupies once a birth time is known. The blending people imagine is a description of missing information rather than a condition of the chart.
The sign and its band
Virgo is mutable earth, ruled by Mercury, and the second decan is the stretch from ten to twenty degrees. The Chaldean order gives that band to Venus, arrived at by counting the planets from Saturn downwards through the whole zodiac. The triplicity scheme gives it to Mercury instead, by grouping the earth signs and taking their rulers in order.
Traditional descriptions of the Venus reading of this band lean on craft and arrangement, the sign's care for detail pointed at things rather than at problems. That is an inheritance, not an observation, and this site marks it as such. The degree underneath it is the part that can be checked.
What still needs an hour
The Moon on any 11 September will be in one of two signs, depending on the time, and in a few years in one of three. The rising sign is entirely undetermined by the date, since all twelve rise in the course of a day and roughly two hours apiece.
Those two placements between them decide most of what makes one chart unlike another, and neither can be read off a calendar. The Sun is the part everyone born within a fortnight of you shares. It is the placement that puts you in a category, and the rest of a chart is what takes you out of it again.
Questions people ask about this
Is 11 September in the second or third decan of Virgo?
The second, in every year covered by ordinary charts. The noon position peaks a little below the twenty degree line that starts the third decan.
How close to the decan boundary is this birthday?
Within about a degree in the highest years, which is roughly a day's motion of the Sun. A late evening birth sits nearer the line than a morning one.
Does being near a boundary weaken the placement?
No. The Sun is at one longitude at any moment, and that longitude is inside one band. Proximity to a line matters for aspects and houses, not for whether the band applies.
What sign is 11 September?
Virgo, with no doubt attached. The date is around a fortnight from both boundaries, which move by hours at most between years.
Who rules the second decan of Virgo?
Venus in the Chaldean order and Mercury under the triplicity scheme. The two traditions disagree and neither is decided by observation.
What does the widget above tell me?
It computes the Sun's longitude for your own year, birth time and birthplace, gives the decan that follows from it, and reports the distance to the nearest sign boundary.