What's happening
The Sun's ingress into Gemini occurs when its ecliptic longitude crosses from 30° Taurus into 0° Gemini, roughly a month before the summer solstice in the northern hemisphere. Gemini is the third sign of the tropical zodiac, and the Sun spends about thirty days traversing it.
Gemini is the first of the mutable signs — the transitional signs that end each season and pivot toward the next. The Sun here marks the final arc of spring before the pivot into summer at 0° Cancer.
The tradition
Gemini is a mutable air sign, ruled by Mercury. The tradition describes it as the mind in motion: language, curiosity, short trips, siblings, commerce, the web of small exchanges that make a neighbourhood function. Mercury's rulership gives the month its verbal texture — words, ideas, messages, signals.
Classical readings frame Gemini as the sign most at home with multiplicity. It does not choose between the two options; it is the two options, held at the same time, and usually enjoying the tension.
How to work with it
Use the month for reading, writing, learning, and talking. Send the message you have been composing in your head for a week. Pick up the study that stalled in February. Take the short trip. Let your attention follow something light enough that following it costs nothing.
The shadow is scattering — reading everything, finishing nothing, mistaking input for thought. Gemini rewards curiosity that comes back around to synthesis; it penalizes the kind of restlessness that cannot sit with a sentence long enough to hear its own meaning.
The simple rule
Ask what question you are actually carrying. The Sun in Gemini is the month when naming the question out loud often does most of the work.