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Air · Mutable

Gemini

The Twins, the 3rd sign of the zodiac year, usually printed as 21 May – 20 June.

A hand-coloured star card of Gemini: the twins Castor and Pollux seated together, one in a red cloak holding a club, the other raising a bow, with a yellow lyre between them.
Gemini · Sidney Hall · Urania's Mirror; or, A View of the Heavens, London, 1825
Element
Airintellect, communication and sociability, in the tradition
Modality
Mutablethe signs that close a season, traditionally read as adapters
Traditional ruler
MercuryAssigned before the outer planets were found
Modern ruler
MercurySame as the traditional ruler.

When the sun actually crosses

The moment the sun enters Gemini and the moment it leaves for Cancer, each year from 2015 to 2026, in UTC to the minute.

20 May 00:0020 May 06:0020 May 12:0020 May 18:0021 May 00:0021 May 06:0021 May 12:0020122016202020242010202620 May 00:0020 May 06:0020 May 12:0020 May 18:0021 May 00:0021 May 06:0021 May 12:00201220162020202420102026
Where the sun crossed into Gemini, 2010–2026, in UTC. The marked years are the ones where a 29 February has fallen in between and pulled it back by most of a day.
YearSun enters GeminiSun leaves for Cancer
201521 May, 08:45 UTC21 June, 16:38 UTC
201620 May, 14:36 UTC20 June, 22:34 UTC
201720 May, 20:31 UTC21 June, 04:24 UTC
201821 May, 02:15 UTC21 June, 10:07 UTC
201921 May, 07:59 UTC21 June, 15:54 UTC
202020 May, 13:49 UTC20 June, 21:44 UTC
202120 May, 19:37 UTC21 June, 03:32 UTC
202221 May, 01:23 UTC21 June, 09:14 UTC
202321 May, 07:09 UTC21 June, 14:57 UTC
202420 May, 13:00 UTC20 June, 20:51 UTC
202520 May, 18:55 UTC21 June, 02:42 UTC
202621 May, 00:37 UTC21 June, 08:25 UTC

VSOP87, checked against published equinox and solstice times.

Which dates can be Gemini

Since 1920 the sun has entered Gemini on 20 May, 21 May or 22 May, and left it for Cancer on 20 June, 21 June or 22 June (UTC). On those dates the sign depends on the year, and in a crossing year on the hour; each date's page gives every year.

In the tradition

In Western astrological tradition, Gemini is classed as a mutable air sign. Mutable signs are the signs that close a season, traditionally read as adapters, and air signs are traditionally associated with intellect, communication and sociability. Its ruling planet in that tradition is Mercury.

These are associations reported from tradition, not claims about anyone born under the sign.

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