The phrase "heavenly twins" refers to the celestial bodies Castor and Pollux, also known as the Gemini twins, in Greek mythology. These twins were the sons of the god Zeus and the mortal Leda, and were known for their bravery and strength.
In astrology, the Gemini sign is represented by the twins, and is associated with communication, intelligence, and adaptability. People born under the sign of Gemini are believed to possess these traits and are often described as versatile and quick-witted.
The term "heavenly twins" is also used in the context of crosswords to refer to a clue that has two parts, each of which gives a separate answer. For example, a clue might be "Heavenly twin of Pollux, to astronomers" and the answer would be "Castor." In this case, the clue is referring to the celestial bodies Castor and Pollux, and the two parts of the clue give separate answers that fit together to form the overall solution.
Overall, the phrase "heavenly twins" refers to the mythological twins Castor and Pollux, as well as the astrological sign Gemini, and can also be used in the context of crosswords to refer to clues that have two parts.