Who are Dian in her orb and Venus? What is Claudio saying?

Diana was one of the three virgin goddesses of Roman and Greek mythology. She was the goddess of hunting and the moon, which is represented by "her orb. Diana was said to be chased. She was supposed to be the equivilent Artemis in Greek Myth. Claudio thought Hero was like ths but now, evidently not.

Dian is a virgin roman goddess. Claudio thought that Hero was a virgin like Dian, and she is. But due to Don John's cunning act, Hero is considered a sinner and is insulted as a slut. Venus is a roman goddess of love, sex and beauty.And she is known to be hot-blooded. So Hero is being compared to Venus.