Shani Dhyan Mantra

Nilanjana samabhasam raviputram yamagrajam
chaya martanda sambhutam tam namami shani ishcharam

Meaning

I bow to Lord Shani, who is black in colour and son of Sun and born to Chaya and brother of Yama , who moves very slowly.

Saneeswaran is reputed to be both a giver and destroyer. Anyone who sincerely pray to Shanidev will not only be freed from troubles but also gets a life that one desires.