Why every page says the same thing
Sun sign writing works from a table of date ranges, so every date inside a range gets the same paragraph. That is why a page about this birthday tends to repeat the sign, the element, the modern ruler and a short list of adjectives, none of which distinguish 26 February from 8 March.
The alternative is to state the position. The Sun on this date, taken at noon, has stood between about six point seven and eight point one degrees of Pisces in every year from 1930 to 2035. That figure belongs to the date rather than to the sign.
Why the figure holds steady
A century is long enough for a badly designed calendar to lose weeks against the seasons. The Gregorian rule prevents that by inserting a day nearly every fourth year, which keeps the average calendar year within half a minute of the tropical year.
The practical effect is visible here. Successive common years push the solar position on a fixed date forward by about a quarter of a degree at a time, then the leap day pulls it back by nearly a degree. Instead of drifting, the position circles the same spot inside a band of under a degree and a half.
The same reasoning explains why the sign dates themselves shift by a day between years. It is the calendar moving under a fixed astronomical event, not the event moving.
The first decan and its ruler
Each sign splits into three ten degree bands. Seven degrees of Pisces lies in the first of them, which runs to the ten degree mark. In the Chaldean order the rulership of the thirty six decans repeats through Mars, Sun, Venus, Mercury, Moon, Saturn and Jupiter, and counting from the beginning of Aries brings Saturn to this band.
Traditionally that is read as the part of Pisces with the most resistance in it, patient rather than yielding, and more comfortable with limits than the sign's reputation suggests. It is one interpretive layer among several, and worth treating as a tradition with a history rather than a fact about a person.
The competing triplicity scheme distributes the decans of a sign among the signs sharing its element, and it produces a different ruler for this band. Neither scheme is the correct one in any settled sense, and most articles quote one without saying which.
The parts still open
None of the above tells you where the Moon was. It changes sign every two or three days, so a birth early on 26 February and one late in the same day can differ. The rising sign is entirely a function of the hour and the latitude, and any of the twelve is possible.
The widget above takes your year, hour and birthplace and returns the exact solar degree along with the distance to the nearest sign boundary. On this date that distance is large, which is the reassuring version of the answer: nothing about the sun sign is in question.
That is not a gap to be embarrassed about. A great deal can be said from a date alone, and what cannot be said is worth naming clearly rather than papering over with a general description that would fit anyone.
Questions people ask about this
Is 26 February a Pisces birthday?
Yes, in every year. The Sun crosses into Pisces several days before this date, so there is no year in which a 26 February birth falls in Aquarius.
What is the solar degree on 26 February?
About seven degrees of Pisces. Noon values between 1930 and 2035 run from roughly six point seven to eight point one, so the variation across a century is small.
Which decan does this date fall in?
The first decan of Pisces, from zero to ten degrees, ruled by Saturn in the Chaldean scheme. This is the layer that separates one Pisces birthday from another.
Why do birthday pages all read alike?
Because they are generated from the same table of sign date ranges, which cannot distinguish between dates inside a range. A position based page can, since the degree changes daily.
Does the decan change anything about the sun sign?
It refines it rather than overriding it. The Sun is in Pisces regardless, and the decan describes which third of the sign it occupies and which planet the older tables attach to that third.
What still needs a birth time?
The Moon sign in many years, the rising sign always, and every house placement in the chart, since houses are measured from the Ascendant.