Rounded tables against a moving boundary
The Sun enters Virgo at one hundred and fifty degrees of ecliptic longitude, and across the last century that crossing has always happened before noon on 24 August. So the noon answer is Virgo, without a single exception in those one hundred and six years.
The confusion is editorial rather than astronomical. A magazine or a school textbook has to print one range that will hold for every reader in every year, so it picks a day and stops. Because the true boundary sits close to the join between the twenty third and the twenty fourth, one publisher rounds it up and another rounds it down, and the reader who compares them concludes that astrology cannot make up its mind. What actually varies is the rounding.
Why the true boundary will not sit still
The tropical year is about a quarter of a day longer than the three hundred and sixty five days the calendar counts. That surplus makes each ingress arrive roughly six hours later on the clock than it did the previous year, until a leap day intervenes and throws it back by something close to eighteen hours. Watch the Leo to Virgo boundary across a decade and you will see it travel over about a day and a half of calendar time before it comes back.
That drift is large enough to be worth respecting even when the tally is unanimous. A birth in the first hours of 24 August in a year where the crossing fell late, in a time zone well behind Greenwich, is the sort of case that can still land on the Leo side. It is not the common case, but it is the reason to calculate rather than assume.
The hour and the country still count
An ingress is one moment for the whole planet, and only local clocks differ. When the Sun enters Virgo at 05:00 UTC, that instant is one in the morning in New York and ten in the evening the previous day in Los Angeles. So the calendar date attached to the change is not the same everywhere, and an American birth certificate can carry a date that seems to contradict the tally above while agreeing with it perfectly.
Mishandling that conversion is how most wrong sun signs are produced. The widget above puts the year, the hour and the birthplace together, works out the single instant they describe, and reports how many hours it stood from the boundary.
Leo, Virgo, and the absence of a cusp
Leo is fixed fire ruled by the Sun, read as expressive and invested in what it produces. Virgo is mutable earth ruled by Mercury, read as analytic, particular and quietly critical. The popular pictures make these opposites, the performer against the perfectionist, but they meet on standards: both are described as caring intensely about whether a thing is done well, one in public and one in private.
They do not meet in a person's chart, though. The Sun sits at exactly one longitude at any instant, and one longitude belongs to one sign. A minute before the change you are entirely Leo, a minute after it you are entirely Virgo, and no gradual handover takes place. The cusp is a description of what nobody looked up, not of a condition the Sun can hold. And whichever it is, it is one placement. The Moon, the Ascendant and everything else in the chart are exactly where they were.
Questions people ask about this
Is 24 August Leo or Virgo?
Virgo. At noon it has been Virgo in every year from 1930 to 2035 without exception. Only an unusual combination of a late crossing and a far western birthplace could produce a Leo result.
Then why do so many sites list 24 August under Leo?
Because they print a fixed range for a boundary that moves, and the boundary here sits near the join between the twenty third and the twenty fourth. Different publishers round it in different directions, which is why their tables disagree.
Do I need my birth time for this date?
Not usually, since the crossing has already happened by the time the day starts in most places. It is still worth entering if you have it, particularly for a birth in the small hours in the Americas.
Am I a Leo Virgo cusp?
No, there is nothing to be on. At any instant the Sun holds one ecliptic longitude that lies inside a single sign, so the change is instantaneous. The cusp label describes birth details that were never checked.
How far can the boundary really move between years?
Over about a day and a half across a decade. The ingress arrives roughly six hours later each year and jumps back about eighteen hours after a leap day, so it circles within that band rather than staying put.
Does an early degree of Virgo mean a weak Virgo?
No. A Sun at one degree of Virgo is as much in Virgo as a Sun at twenty nine. Where a planet sits inside its sign affects aspects and houses, not whether the sign applies.