Usually during a Chandra Grahan, a fast (Upvaas) is observed by certain communities in Hindu religion. The fast begins about 9 hours before the
beginning of Chandra Grahan.
People also take a bath in cold water and chant mantras dedicated to Lord Vishnu or Shiva like the Ashtakshara Mantra or
Maha Mrityunjaya Mantra,chamunda mantra,durga mantra,mahavidhya mantra,gyatri mantra, This is done whenever Surya and Chandra are under the
influence of Rahu. Pregnant women chant the Santana Gopala Mantra.