1 (geometry) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.  A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.
To the Jews, solar eclipses meant that the moon was passing between the sun and the earth, thereby blocking the suns light. Notwithstanding the physical explanation of a solar eclipse, there is also spiritual significance to it: At the time when the sun is eclipsed, it is an unfavorable period for the world. A parable: This can be compared to a human king who made a feast for his subjects, and placed a lantern before them.
May 21 - June 21. The glyph for Gemini represents the heavenly twins and its ruling planet is Mercury. Gemini is the third sign of the zodiac a member of the the horns of the ram. Aries is the first sign of the zodiac, a mutable sign, masculine and of the air element. The Sun enters the sign of Gemini around 21 May and exits around 21 June. Symbolically the written symbol of Gemini corresponds with the Roman numeral for 2 which indicates the essential duality of the sign.