Pradosh Vrat or Fasts / Site / Mahima / Videos

The performance of the vrata involves a fast followed by a vigil. A bath is taken one hour before sunset and 

1. Lord Shiva, 
2. Goddess Parvati, 
3. Ganesha, 
4. Skanda, and 
5. Nandi are worshipped. 

Following this, Lord Shiva is invoked. The Pradosh story is read out after the formal worship is concluded.
https://freeglobaluniversity.blogspot.com/search/label/ShivaSpousesSkandaGaneshaAgastyaHanumanVyasaEarthMosesBuddhaChristMuhammadKabirSai
https://freeglobaluniversity.blogspot.com/search/label/Bull

https://www.google.com/search?q=Shivratri

When Pradosham day falls on

1. Monday it is called Soma Pradosham, 
2. Tuesday it is called Bhauma Pradosham and 
3. Saturday it is called as Shani Pradosham.

https://en.wikipedia.org/wiki/Pradosha_vrata
http://www.s-a-i.info/assoc_change/pradosh.html
http://pradosham.com/

http://www.google.com/search?q=Pradhosha&tbo=p&tbm=vid&source=vgc&aq=f 

Kalam

https://www.google.com/search?q=pradosha+kalam
Purana
http://kshetrapuranas.blogspot.com/2011/02/twilight-original-story-pradosha-purana.html 

Maha Pradosh <=> Maha Shiva Ratri
http://lordofsnake.blogspot.com/search/label/MahaPradosham