Shani dev is one of the Navagraha (the nine primary celestial beings in Hindu astrology) of Jyotiṣa. Shani dev is embodied in the planet Saturn and is the Lord of Saturday. Shani dev is also known as Śanaiścara (शनैश्चर). The word Shani also denotes the seventh day or Saturday in most Indian languages. Shani is a Deva and son of Surya and his wife Chaya, hence also known as Chayaputra. He is the elder brother of Yama, the Hindu god of death, who in some scriptures corresponds to the deliverance of justice. Shani Chalisa is 40 verses prayer in praise of Shani dev. ecitation of ‘Shani Chalisa’ with devotion provides his bliss. One who chants Shri Shani Chalisa regularly gets rid of bad karmic influences, marital and personal problems; besides eliminating Shani Dosh, Sade Sati and Dhaiya completely. To reduce bad effects of Sade Sati and Dhaiya period, on Saturdays one should light an lamp with mustard oil and pour some oil along with Black Sesame seeds ( kala til ) on the idol of Shani dev. According to scriptures, whoever listens or Chants ‘Shani Chalisa’ with faith in heart reaps great benefits and succeeds in all dimensions of life.