Shani is of the 9 planets. According to Hindu mythology Shani (Saturn) is son of Sun & Chaaya . It is believed that Shani & Sun (Surya Devta) are bitter enemies although they are close relatives. Therefore Shani mantra jaap is done when Sun sets .Yamraj (the lord of death), Dharamraj & Yamuna River are brothers & sister of Shani Maharaj. The 4 Ashwin Kumars (Sons of Surya & Usha) are step brothers of Shani Maharaj.
Shani is considered as the lord of Justice. Lord Shiva has assigned Shani Maharaj the duty to do justice with each & every individual. Therefore during Shani ki Sadae Saati ( 7.5 years dasha ) & Shani ki Mahadasha ( 19 years dasha ) each individual is rewarded or punished according to his past actions by Shani Maharaj .In every individual’s life there is at least one Shani ki Sadae Saati & one Shani ki Mahadasha . During these dashas the individual must sincerely worship Shani Maharaj at any cost. Even regular worship of Shani Maharaj helps the person to remain healthy & wealthy.
One can please Shani Maharaj by following ways.
1)CHANTING MANTRA : “ Om Shum Shanishchraay Namah :for at least 108 timeswith Sandal wood beads mala but remember not to chant the mantra with Tulsi beads mala . The mantra should be chanted after Sun set. The person should take a bath & should wear black clothes. Also offer Gur ( jaggery ) & Kali Urad dalkhichadi (Black Gram) to Shani Maharaj. After the pooja distribute the Prasad among the family members.
2)CHARITY: Donate black color cloth to the poor. On every Saturday offer Mustard oil & money in the Shani Mandir. Donate Iron metal goods to the poor on Saturday.
3)GEM STONE: Neelam (Blue Sapphire) should be worn on the gemologist & astrologer’s advice only
It is also very important to chant Shani's wives mantra which is as follows at least for 108 times on every Saturday after Sun set .