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January birthdays fall under Capricorn or Aquarius. Early January is Capricorn season, while later dates belong to Aquarius, with cusp days where the sign can depend on the year.
Every day of January has its own personality page with cusp detection, famous birthdays, and year-exact sign verification.
Amber-highlighted days are in a cusp window — the exact sign depends on birth year and time.
January birthdays fall under Capricorn and Aquarius. Early-month birthdays usually belong to the first sign; later in the month the Sun crosses into the next.
The sign change in January falls around day 19 to day 20. Exact cusp timing shifts slightly each year — check the zodiac sign calculator for your year.
January hosts two signs with different elements and modalities, so compatibility varies. Use our compatibility calculator for your exact sign combination.
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