Ardra literally means "the moist one," and is therefore considered an indicator of the initiation of the proper rainy season with the entry of the Sun into this Nakshatra. Every year, this occurs on or around 21 June.
Its ruling deity, Rudra, is described in the scriptures as the God of rain and all forms of water. Water is considered the first and foremost of the eight manifestations of Lord Rudra.
Ardra has only one prominent star, which appears like a raindrop or a diamond. Therefore, Ardra itself is considered to represent Lord Rudra, while the companion star is regarded as his consort, Goddess Parvati or Rudrani, as stated in the Taittiriya Brahmana.