Why the answer is always Virgo
The Sun crosses into Virgo when it reaches one hundred and fifty degrees of ecliptic longitude, and leaves at one hundred and eighty. Those crossings fall around 22 or 23 August and around 22 or 23 September, wobbling by a day either way as the leap year cycle pushes them about. Early September sits comfortably inside that stretch.
So the usual hedging about cusps has no place on this date. There is no year since 1930, and none coming before 2035, in which a birth on 6 September falls outside Virgo. The hour of birth does not change it, and neither does the country. That much is settled, and it is why the rest of this page is about something else.
The degree, which is the fact nobody prints
Taking noon as the reference, the Sun on this date has stood between roughly thirteen degrees of Virgo and fourteen and a third across the whole span from 1930 to 2035. That is a spread of a little over one degree in more than a hundred years, which surprises people who expect the calendar to drift badly.
It stays that tight because the leap day is a correction, not an accident. Three years running, the date creeps about six hours later against the Sun, and then February gains a day and hauls it back. The result is a slow sawtooth that never wanders far from where it started. The degree in your own chart depends on which year you were born in and, to a smaller extent, the hour and the place. The widget above works it out exactly.
The Venus band inside Virgo
Every sign divides into three bands of ten degrees, called decans, an idea inherited from Egyptian star clocks and later fitted with planetary rulers. Thirteen degrees puts this birthday in the middle band, from ten to twenty, and in the Chaldean order that band belongs to Venus.
Tradition reads the middle band of Virgo as the one where the sign's carefulness turns outward, towards craft, arrangement and things made well for their own sake, because Venus is the planet those associations hang on. That is interpretation and should be read as interpretation. What is not interpretive is the position, which any ephemeris will confirm. Almost every birthday page on the internet stops at the sign name and never mentions this layer at all.
What the date leaves open
The Moon moves through roughly half a sign each day, so on any given 6 September it will be in one of two signs, occasionally three if the change falls near midnight somewhere. Two people sharing this birthday can easily have Moons in different signs and different elements.
The rising sign is wider open still. It turns through the whole zodiac every day, which means all twelve are possible on this date and the hour of birth is the only thing that decides. A chart also carries the Moon's phase, the positions of Mercury and Venus close to the Sun, and the houses, none of which the calendar date fixes. The sun sign is the part of a chart that the largest number of strangers share with you, which makes it the least personal thing in it.
Questions people ask about this
Is 6 September always Virgo?
Yes. The date sits well inside Virgo season in every year, so no birth hour, year or country can move it. The Leo boundary is a fortnight behind and the Libra boundary a fortnight ahead.
What degree of Virgo is a 6 September birthday?
At noon it has fallen between about thirteen and fourteen and a third degrees over the last century. Your own figure depends on the year and, more finely, on the time and place of birth. The widget above returns it.
Which decan is 6 September?
The middle one, running from ten to twenty degrees of Virgo. In the Chaldean scheme that band is ruled by Venus, while the triplicity scheme gives it to Mercury instead.
Does the degree affect my personality?
Astrological tradition attaches meaning to it, mainly through the decan and through any aspects the Sun makes. Whether that meaning holds is a separate question, and this site marks it as tradition rather than measurement.
What is my Moon sign if I was born on 6 September?
It cannot be read off the date. The Moon changes sign every two and a half days, so this birthday allows two possibilities and sometimes three. A birth time and place narrow it to one.
Do I need a birth time for this date?
Not for the sun sign, which is fixed. You need it for the rising sign, for the houses, and for pinning the solar degree down to the minute rather than the day.