Pradosh Vrat and Sankashti Chaturthi: Rules, Timing and Meaning

Pradosh Vrat is dedicated to Shiva and Parvati; Sankashti Chaturthi is dedicated to Ganesha. Both are observed every lunar month, both are tied to a particular time of day rather than just a date, and both are popular enough that their exact timing is the most frequent question people ask of an almanac.

Pradosh falls on the Trayodashi (13th) tithi, twice a month — once in each fortnight. The vrat is kept when Trayodashi is present during Pradosh Kaal, the twilight period around sunset. Traditions reckon this window slightly differently: some count from shortly before sunset to shortly after, others from sunset for about two hours. The evening puja to Shiva, with an abhishek of water, milk or bilva leaves, is done in this window.

Because the rule is tied to sunset, the date of Pradosh can differ from the date on which Trayodashi begins. When Trayodashi covers the evening of two consecutive days, or neither evening completely, panchangs decide by rule, and you may see two different dates published.

The weekday on which Pradosh falls gives it a name. Som Pradosh (Monday) is regarded as especially auspicious for Shiva, Bhauma Pradosh (Tuesday) is associated with relief from debt and the Mars-related concerns, and Shani Pradosh (Saturday) is associated with Saturn and is popular among people in Sade Sati or Dhaiya. These associations are traditional and are practised with devotion rather than as fixed rules.

Some fast through the day, taking only fruit and water; others take a single meal after the puja. The evening is spent at a Shiva temple or at home with the Shiva lingam, with chants such as Om Namah Shivaya or the Shiva Chalisa. The fast is broken after the puja.

Sankashti Chaturthi falls on the Chaturthi (4th) tithi of the dark, waning fortnight. Sankashti means "relief from difficulty". The fast is broken in the evening after moonrise, when the Moon is sighted and offered water. This means the correct date is the one on which Chaturthi is present at moonrise, and moonrise times vary noticeably by city.

When Sankashti Chaturthi falls on a Tuesday it is called Angaraki Sankashti Chaturthi (Angaraka is Mars) and is considered especially powerful. In North India, the Magha-month observance is known as Sakat Chauth. Each Sankashti has its own name and story in the tradition, told as the month's vrat katha.

The Chaturthi of the bright fortnight is called Vinayaka (or Vinayagar) Chaturthi. Here the worship is in the middle of the day rather than at moonrise, and the Moon is traditionally not looked at. The largest of these is Ganesh Chaturthi in the month of Bhadrapada.