They will ascend, and forever dwell in My heavenly places, loved by Me and rejoicing in My salvation. And after three months we departed in a ship of Alexandria, which had wintered in the isle, whose sign was Castor and Pollux. The constellation in the zodiac which represents the two witnesses is Gemini. 0n leaving the island of Melita, Paul took a ship of Alexandria whose sign, we are told, was Castor and Pollux. It is a reference to the sign of Gemini.
Some representations makes Gemini into two women.
Sometimes the sign is revealed as two children. In any description, they are two, and they are twins. They also are seen with a harp. The harp is an instrument of praise. And when he had taken the book, the four beasts and four and twenty elders fell down before the Lamb, having every one of them harps, and golden vials full of odours, which are the prayers of saints.