Deep inside, and how deep
A sign is thirty degrees wide, so its middle falls at fifteen. On 7 November the noon Sun runs from about 14.2 to 15.5 degrees of Scorpio across the years from 1930 to 2035, which puts every year in that span within roughly a degree of the centre.
In days that means about a fortnight of Scorpio behind and a fortnight ahead. No plausible error in a birth record moves the answer, since a mistake would have to be two weeks wide to matter. Compare that with the dates in the third week of October or the third week of November, where a few hours can change the sign, and the difference in how much confidence the date carries becomes obvious. A birthday deep inside a sign is one of the few cases where the popular tables and a proper calculation are guaranteed to agree.
Why distance from a boundary is worth measuring
The widget above reports how far a position sits from the nearest sign boundary, and that figure does more work than it might appear to. It tells you whether the sun sign is a safe conclusion or a provisional one, and it tells you whether an unknown birth time can be ignored.
For a date this deep in a sign, an unknown hour costs you nothing at all where the Sun is concerned, because the whole day fits inside the same degree and a bit. For a date near a crossing, the same missing hour can leave the answer genuinely open. The distance is the number that separates the two situations, and quoting it is more honest than simply stating the sign and letting the reader assume it was never in question.
Fifteen degrees and the face it sits in
The middle face of Scorpio covers ten to twenty degrees, so a Sun near fifteen is halfway through it and nowhere near either of its lines. The Chaldean order of decans hands that band to the Sun, and the triplicity scheme, working by element, hands it to Pisces.
The result is a stretch of Scorpio the tradition reads as less closed than the opening degrees and less final than the closing ones. A solar attribution in a water sign is unusual enough that older texts single it out, and the Pisces overlay from the other count softens the picture further. That is a reading rather than a measurement, and both attributions are offered here as what the tradition says, not as a claim about anyone.
The parts that stay unsettled anyway
Being deep inside a sign settles the Sun and nothing further. The Moon crosses about half a sign in a day, so on this date it will be in one of two or three signs depending on the year, and it often changes sign during the day itself.
The Ascendant is untouched by the calendar. It follows the rotation of the Earth, moves through all twelve signs in twenty four hours, and depends on the birthplace as well as the clock. So a date can be as unambiguous as this one and still leave most of a chart open. The confidence you can have about the sun sign here does not transfer to anything else. The houses in particular are entirely a function of the hour and the place, and they decide which area of life each placement is read as belonging to.
Questions people ask about this
Is there any doubt about the sign on 7 November?
None. The Sun is close to the middle of Scorpio, about a fortnight from either boundary, so no year, hour or time zone moves the answer.
What degree is the Sun on this date?
Around fifteen degrees of Scorpio. Noon values run from roughly 14.2 to 15.5 across 1930 to 2035, and the widget above gives your own figure from year, hour and place.
Which decan is 7 November?
The second face, ten to twenty degrees, and about halfway through it. The Chaldean order gives that band to the Sun and the triplicity scheme to Pisces.
Does a missing birth time matter here?
Not for the sun sign. The Sun covers under a degree in a day and the whole day sits deep inside Scorpio. It matters a great deal for the Moon, the Ascendant and the houses.
Is the middle of a sign significant?
It is a geometric fact rather than a claim. Some practitioners note that fifteen degrees of a fixed sign is a sensitive point in certain techniques, but that is a technical usage, not a statement about the person.
How far is this date from Sagittarius?
About a fortnight. The Sun leaves Scorpio around the twenty second of November, so there is no boundary anywhere near this birthday.