The one thing the date decides
At noon across the years from 1930 to 2035 the Sun on this date has been between about two and three quarters and four degrees of Pisces. The window is narrow because the leap day keeps the calendar aligned with the orbit, and it sits several days clear of both the entry into Pisces and the far end of the sign.
From that single number two further facts follow arithmetically. The date falls in the first decan of Pisces, the band from zero to ten degrees, and the Chaldean order of rulers assigns that band to Saturn. Sign, degree and decan are the full extent of what a date can give.
Your own year decides where inside that window the Sun falls, with leap year births near the lower edge and the figure creeping up through the three years that follow.
The Moon, which needs the hour
The Moon travels between twelve and fifteen degrees a day, so it changes sign roughly every two and a half days. On any given 22 February it will occupy one sign for part of the day and the next for the rest, and which of those two you get depends on the clock time and the time zone of the birth.
Over a run of years the Moon on this date has been in all twelve signs. There is no lunar sign that belongs to a calendar date, and any page that offers one has substituted a guess for a calculation.
The horizon, which needs the place as well
The rising sign is the degree coming over the eastern horizon at the moment of birth, and the Earth's rotation carries it through all twelve signs every day. It therefore changes roughly every two hours, which makes it the most individual point in the chart.
Latitude matters too, because the zodiac is tilted against the equator and signs rise at very uneven speeds away from it. The same hour gives a different Ascendant in Helsinki and in Singapore, so a birth chart requires coordinates rather than a country name.
Longitude has a second job, which is converting the recorded clock time to universal time. Historical daylight saving rules vary by country and by decade, and getting that step wrong is one of the commonest sources of a wrong Ascendant.
Putting the Sun in proportion
Because the Sun is the slowest of the personal placements, everyone born within a day of you anywhere on Earth shares it. That makes the sun sign the least distinguishing part of a chart, which is a strange fate for the one part that popular writing treats as the whole.
Tradition reads Pisces as mutable water, classically ruled by Jupiter and in modern practice by Neptune, with the first decan taking a more contained character from Saturn. Those are interpretations laid over a measurement. The widget above supplies the measurement itself from your year, time and birthplace, along with the distance from your birth to the nearest sign boundary.
Marking the difference between the two is the whole point. The degree can be checked against an ephemeris, while the character attached to a sign or a decan is a tradition, and the pages that blend them leave the reader unable to tell which is which.
Questions people ask about this
What sign is 22 February?
Pisces, around three degrees in. The Sun entered the sign three or four days earlier, so no year in the modern calendar changes the answer.
What does my birth date actually determine?
The sun sign, the solar degree to within about a degree and a half, and the decan that follows from it. Nothing faster moving than that.
Can the Moon sign be worked out from the date alone?
No. The Moon changes sign every two and a half days or so, so the hour and the time zone are needed, and across years it has been in every sign on this date.
Why is the rising sign so variable?
Because the Earth turns once a day, carrying the whole zodiac past the horizon. That gives roughly two hours per sign, adjusted heavily by latitude.
Which decan is three degrees of Pisces?
The first decan, from zero to ten degrees, assigned to Saturn in the Chaldean order even though Pisces itself answers to Jupiter and Neptune.
Is the sun sign unimportant then?
Not unimportant, just widely shared. It is a real placement, but it is the one that separates you least from other people.