Sidereal Sun Sign Dates
Sidereal Gemini Dates
June 15 to July 16
Lahiri (IAE 1985) ayanamsa · approximate dates for 2020 to 2050 · shifts ~1 day per 72 years
In the Lahiri sidereal zodiac, the Sun enters Gemini on approximately June 15 and leaves on approximately July 16. This corresponds to most of what tropical astrology calls Cancer. If you were born between roughly June 15 and July 16, your sidereal Sun sign is Gemini.
Why does sidereal Gemini start on June 15?
The summer solstice (around June 20 to 21) falls in early sidereal Gemini. In the tropical system, the solstice marks 0° Cancer, linking it to themes of home and emotional retreat. In the sidereal framework, the longest day of the year belongs to the sign of movement, communication, and duality. This is one of the points where the two systems assign genuinely different archetypal flavors to the same astronomical moment. The ingress date shifts approximately one day every 72 years as precession continues.
What if you were born on the cusp?
People born in the last week of tropical Gemini (roughly June 15 to June 21) are in the cusp zone. Your tropical Sun is Gemini but your sidereal Sun may also be Gemini depending on the year and exact crossing time. Calculate your sidereal chart for a precise answer if you were born in this window.
Get your complete sidereal chart
The Sun sign dates above are approximate. Your full chart includes Moon, rising, and all planets in the Lahiri sidereal zodiac, plus the exact ayanamsa applied to your birth date.