Hindu calendar month has on 30 tithis divided into two pakshas — Krishna Paksha and Shukla Paksha. Each paksha starts with Purnima means full moon day and Amavasya means no moon day.
Amavasya falling on Saturday is called Shani Amavasya, which is dedicated to Lord Shani. This year, Shani Amavasya falls on Saturday, March 13 in Phalguna Maas.
The day is believed to be auspicious to perform havan and to observe fast or upvaas to propitiate Lord Shani. Devotees also visit Shani temples to seek good luck and fortune.
It is considered a holy day to get rid of doshas. The pictorial depiction of lord Shani is dark complexion god dressed up in black clothes holding a sword, arrows, two daggers and mounted on a black vulture.