Once Dhevas and Asuras using the serpent Vasuki and the hill Mandhara were trying to get Amrutham (nector) from the Kseerabthi (milk ocean). Then the terrible poison Halahalam came up. All got frightened and pleaded to Lord Shiva for rescue. Being the peak of mercy Lord Shiva ate that poison. Then as per His order they resumed their effort to get Amrutham. They got it on Dhwadhasi (twelfth moon day). Without praying and thanking the God, by whom they got Amrutham, Devas started dancing and celebrating their victory.
On thrayodhasi (thirteenth moon day) they realised their sin of not praying the God and pleaded for forgiveness. The pleased graceful Lord Shiva forgave them and danced between the horns of the Nandhi (holy bull). That time is called Pradhosham. Whoever prays Lord Shiva in that time, Lord Shiva fulfills their wishes and give them mukthi.
During Prodhosha time anointing (Abhishekam) the Shiva deity with the following is considered fruitful.
Milk gives long life Ghee gives Moksha state Curd gives good children Honey gives melodious voice Rice powder frees from debts Sugar cane juice gives good health Panjamrutham gives wealth Lemon removes fear of death Sugar removes enmity Tender coconut gives enjoyment Cooked Rice(Annam) gives mejestic life Sandal gives Lakshmi's grace
shivAya namaOm bhavAya namaH
bhavAya namaOm namaH shivAya