2009
- Thursday, 8 January 2009 · Guru Pradosh (Shukla)
- Friday, 23 January 2009 · Shukra Pradosh (Krishna)
- Saturday, 7 February 2009 · Shani Pradosh (Shukla)
- Sunday, 22 February 2009 · Ravi Pradosh (Krishna)
- Sunday, 8 March 2009 · Ravi Pradosh (Shukla)
- Tuesday, 24 March 2009 · Bhauma Pradosh (Krishna)
- Tuesday, 7 April 2009 · Bhauma Pradosh (Shukla)
- Wednesday, 22 April 2009 · Budha Pradosh (Krishna)
- Wednesday, 6 May 2009 · Budha Pradosh (Shukla)
- Friday, 22 May 2009 · Shukra Pradosh (Krishna)
- Friday, 5 June 2009 · Shukra Pradosh (Shukla)
- Saturday, 20 June 2009 · Shani Pradosh (Krishna)
- Saturday, 4 July 2009 · Shani Pradosh (Shukla)
- Sunday, 19 July 2009 · Ravi Pradosh (Krishna)
- Monday, 3 August 2009 · Soma Pradosh (Shukla)
- Tuesday, 18 August 2009 · Bhauma Pradosh (Krishna)
- Tuesday, 1 September 2009 · Bhauma Pradosh (Shukla)
- Wednesday, 16 September 2009 · Budha Pradosh (Krishna)
- Thursday, 1 October 2009 · Guru Pradosh (Shukla)
- Thursday, 15 October 2009 · Guru Pradosh (Krishna)
- Saturday, 31 October 2009 · Shani Pradosh (Shukla)
- Saturday, 14 November 2009 · Shani Pradosh (Krishna)
- Sunday, 29 November 2009 · Ravi Pradosh (Shukla)
- Sunday, 13 December 2009 · Ravi Pradosh (Krishna)
- Tuesday, 29 December 2009 · Bhauma Pradosh (Shukla)
2010
- Tuesday, 12 January 2010 · Bhauma Pradosh (Krishna)
- Thursday, 28 January 2010 · Guru Pradosh (Shukla)
- Thursday, 11 February 2010 · Guru Pradosh (Krishna)
- Friday, 26 February 2010 · Shukra Pradosh (Shukla)
- Saturday, 13 March 2010 · Shani Pradosh (Krishna)
- Saturday, 27 March 2010 · Shani Pradosh (Shukla)
- Sunday, 11 April 2010 · Ravi Pradosh (Krishna)
- Monday, 26 April 2010 · Soma Pradosh (Shukla)
- Tuesday, 11 May 2010 · Bhauma Pradosh (Krishna)
- Tuesday, 25 May 2010 · Bhauma Pradosh (Shukla)
- Thursday, 10 June 2010 · Guru Pradosh (Krishna)
- Wednesday, 23 June 2010 · Budha Pradosh (Shukla)
- Friday, 9 July 2010 · Shukra Pradosh (Krishna)
- Friday, 23 July 2010 · Shukra Pradosh (Shukla)
- Saturday, 7 August 2010 · Shani Pradosh (Krishna)
- Saturday, 21 August 2010 · Shani Pradosh (Shukla)
- Monday, 6 September 2010 · Soma Pradosh (Krishna)
- Monday, 20 September 2010 · Soma Pradosh (Shukla)
- Tuesday, 5 October 2010 · Bhauma Pradosh (Krishna)
- Wednesday, 20 October 2010 · Budha Pradosh (Shukla)
- Wednesday, 3 November 2010 · Budha Pradosh (Krishna)
- Friday, 19 November 2010 · Shukra Pradosh (Shukla)
- Friday, 3 December 2010 · Shukra Pradosh (Krishna)
- Saturday, 18 December 2010 · Shani Pradosh (Shukla)
How the date is fixed
Trayodashi, the thirteenth day of each half, kept on the day it is running at pradosh, the twilight after sunset. It is named for its weekday: Soma Pradosh, Shani Pradosh and so on.
About
Pradosh vrat is kept twice a month, on the Trayodashi of each fortnight, during the pradosh period of roughly 96 minutes after sunset. The day is chosen so that Trayodashi is running at sunset, even if it is absent at sunrise; when it touches sunset on two days, the first is usually taken. Each weekday gives the observance a name, Soma Pradosh on Monday and Shani Pradosh on Saturday being the ones most often singled out. In Tamil Nadu the Pradosham puja at Shiva temples, with the Nandi abhisheka, is a regular feature of temple calendars.
How it is observed
A fast until dusk and Shiva worship with abhisheka in the pradosh window after sunset.