The planet Saturn is known as Shani in Vedic Astrology.
Nilanjana samabhasam raviputram yamagrajam chaya martanda sambhutam tam namami shaishcharam
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.
"I bow down to slow-moving Saturn, whose complexion is dark blue like nilanjana ointment. The elder brother of Lord Yamaraj, he is born from the Sun god and his wife Chaya."
Shani Dev is a son of Surya Devta (Sun) and Chhaya (Suvarna). Lord Shani Dev is
the brother of Yama Dev (deity of death). He is generally depicted in dark
complexion, clothed in black. Shani Graha have a seventh place among navagraha.
In Sanskrit Shani is called Sanischara, which means, " slow mover " . Shani spends
2.5 years in each rashi. When we add the 2.5 years in previous and 2.5 years in
next rashi together, the time period of 7.5 years is called Saadasaati Panoti.
Saturday is devoted to Lord Shani Dev.
This Diety in Hinduism who keeps an eye on our deeds and depending on our Karmas we will be rewarded or punished by Shani.Shani is most powerful in the 7th house. Saturn rules over the two sidereal signs of Capricorn and Aquarius. Shani exalts in Libra and falls in the sign of Aries. Saturn is particularly a beneficial planet for Taurus and Libra.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.
"Om Praam Preem Praum Sah Shanaiyshcharaaya Namah"
"Om Sham Shanaiyshcharaaya Namah"
"Om Hlim Sham Shanaye Namah"
"Aum Aing Hring Shring Shung Shanaishcharaye Namah Aum"