The Probert Encyclopaedia of General Information

GEMINI

Gemini, the Twins, is the third sign of the zodiac, so named from its two brightest stars, Castor, of the first magnitude, farthest to the west, and Pollux, of the second, fartliest to the east. Its constituent stars form a binary system revolving in about 250 years. The sun is in Gemini from about the 21st May until about the 21st June, or the longest day.
Research Gemini