Zodiac Sign & Cusp Calculator

Your exact Sun sign from the Sun's true longitude at birth — not an approximate date table

Offset is auto-filled from the city (Sri Lanka historical changes handled). For other countries, adjust for daylight-saving time if it applied at that date.

Sidereal (Vedic)
Taurus

Sun 29°42′

Born on the cusp! Only 0.3° from the Gemini boundary

Tropical (Western)
Gemini

Sun 23°30′

6.5° from the nearest boundary — your sign is unambiguous

Cusp births and why date tables fail

The Sun enters each sign at a specific instant that varies by up to two days across years (leap-year drift), so newspaper date ranges misclassify millions of cusp births. Astronomically there is no ambiguity: at your birth moment the Sun had one exact longitude, computed here to arc-minute precision. Note that the sidereal (Vedic) Sun sign is usually one sign behind the tropical one because of the ~24° ayanamsa — both are shown so you can see where each tradition places you.

Your data stays private. All calculations happen locally in your browser — nothing is sent to any server.

Disclaimer: These tools are for educational purposes only. Although the calculations are performed carefully using established astronomical algorithms, 100% accuracy is not guaranteed. For horoscopes, auspicious times, or important life decisions, please consult a professional astrologer.