How star signs are assigned
The Western zodiac splits the year into 12 signs, each covering a fixed range of dates. Your sign is simply the one whose date range contains your birthday — no birth time or year is needed.
More detail
If you're born on a cusp
Dates near the edge of two signs are called the cusp. The ranges here are the widely used standard, but the exact boundary can shift by a day depending on the year and the system used. If your birthday is on a boundary date, you may see either sign quoted elsewhere.
Sun sign vs. full chart
This tool gives your sun sign — the one most people mean by "my sign." A full astrological chart also uses your birth time and place to place the moon, rising sign, and planets. The sun sign only needs the month and day.
Tip. Only your month and day matter — the birth year doesn't change your sun sign. If you're on a boundary date, note that sources may differ by a day.
Frequently asked questions
What is my zodiac sign?
Enter your birth month and day above. Each sign covers a fixed date range — for example, March 25 is Aries (3/21–4/19) and July 23 is Leo (7/23–8/22). No birth year or time is needed for your sun sign.
What sign is someone born on July 23?
July 23 is Leo, the first day of its range (July 23 – August 22). July 22 and earlier is Cancer, so the 23rd sits right on the Cancer–Leo boundary.
What does 'born on the cusp' mean?
The cusp is a birthday that falls near the boundary between two signs. Because exact boundary dates can shift by a day depending on the year and system, people born on a cusp date sometimes see either sign quoted. This tool uses the standard ranges.
Does my birth year change my star sign?
No. Your sun sign depends only on the month and day. The year matters for a full chart (which also needs birth time and place), but not for the sign itself.