* Astronomy

Castor and Pollux are constantly associated with horses in art and literature. They bear striking similarities in this respect to divine twins in other mythologies, especially the Vedic Ashvins, who like them have a close association with horses. Their role as horsemen made them particularly attractive to the Roman equites and cavalry. Each year on July 15, the feast day of the Dioskouroi, the 1,800 equestrians would parade through the streets of Rome in an elaborate spectacle in which each rider wore full military attire and whatever decorations he had earned.
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The Dioskouroi (or Dioscuri) were twin star-crowned gods whose appearance (in the form of St Elmo's fire) on the rigging of a ships was believed to portent escape from a storm. They were also gods of horsemanship and protectors of guests and travellers.
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The Dioskouroi were a pair of twin demi-gods who were worshipped as the protectors of sea-voyages and guests, and the patron gods of horsemen and races. Their cult was centred on the Lakedaimonian town of Sparta, but it soon spread to other regions of the Peloponnese and beyond, including the city of Rome.
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