(Information added by Jenwytch from Wikipedia.)
Sun Signs and Dates ~ a quick reference guide
|Aries||Ram||21 March-20 April|
|Taurus||Bull||21 April-21 May|
|Gemini||Twins||22 May-22 June|
|Cancer||Crab||23 June-23 July|
|Leo||Lion||24 July-23 August|
|Virgo||Virgin||24 August-23 September|
|Libra||Balance||24 September-23 October|
|Scorpio||Scorpion||24 October-22 November|
|Sagittarius||Archer||23 November-22 December|
|Capricorn||Goat||23 December-19 January|
|Aquarius||Water Bearer||20 January-19 February|
|Pisces||Fish||20 February-20 March|
The dates given above vary slightly from year to year.
For a more detailed (yet relatively brief) description of Astrology and the Zodiac signs please read this Wikipedia article.