By the horoscope, yes, and your sign stays yours. The stars behind it have quietly moved along, though: Capricorn runs from 22 December 2026 to 19 January 2027, and on those dates the Sun is in Sagittarius throughout. This is the sky behind your sign.
Sagittarius, where the Sun spends all of Capricorn’s 29 days, engraved in the old atlas style with its real stars traced over the figure.
Capricorn against the sky, 2026
The horoscope says
22 December 2026 to 19 January 2027 · 29 days
The Sun is really in
Sagittarius22 December 2026 to 19 January 2027 · 29 days
The Sun reaches the constellation Capricornus on 20 January, the day after the sign ends.
Capricorn’s dates were set more than two thousand years ago, pinned to the March equinox, when the signs took their names from the constellations the Sun was crossing. Since then Earth’s slow wobble, called precession, has carried the equinox about a twelfth of the way round the sky, roughly one day’s worth every seventy years. Your sign has kept its dates, and the stars behind them have simply moved along: that is why the Sun now spends Capricorn’s days in Sagittarius.
These dates are computed for 2026 from the constellation boundaries the International Astronomical Union fixed in 1930. A boundary can fall a day earlier or later in another year, so for the particular day, and hour, you were born the calculator will check it for you.