Here is a chart outlining the sidereal zodiac dates. Precession accounts for the 25 day shift of the signs. If you were a Leo born Aug 15, you are a now a cancer under the sidereal zodiac. If you are a Gemini born June 20, you are still a Gemini under the sidereal zodiac. Sidereal astrology isn’t very mainstream because most western astrologers don’t embrace it believing that adhering to the seasonal equinoxes is what matters. Vedic astrology however, does recognize the sidereal shift.