Grahan or Grahanam (Surya Grahan and Chandra Grahan) (Solar eclipse and Lunar eclipse) is very significant as per Hindu traditions and astrology.
Grahan is considered as crucial period for pregnant women, children and old people because of their health condition. Hindus perform several rituals and pujas during Grahan to get rid of bad effects.
There are many mantras, prayers or stotras to chant on Grahanam day especially for good health of pregnant women, children and old people.
Shiva Panchakshari Mantram, Mahamrutyunjaya Mantram, Santana Gopala Mantram, Vishnu Sahasranama Stotram, Aditya Hrudayam (Surya Mantram) and Vishnu Ashtakshari or Narayana Ashtakshari stotram are some of the mantras chanted during Chandra Grahan as well as Surya Grahan.