Anagha means that which comes to the experience of the doer (kartaaram anghaati iti agham. Aghi gatow). He who thinks that he is the doer, will experience pain and pleasure. According to vedantic view, even the worldly pleasure is in fact pain. Thus, one who thinks oneself to be the doer is always suffering. That energy which removes the feeling of doership is Anagha. According to another etymology, Agha means that which causes sufferings to remain for ever. (Na jahaati duhkham it agham. O haak tyaage) Sorrow is caused by poverty, disease, fear of enemies, greed , ignorance etc.. That which removes sorrow by bestowing prosperity, health, affection, contentment, wisdom etc., is Anagha.
Anagha vratham can be performed on Margasira bahula ashtami or on any bahula ashtami of any month.The most important day for this worship is the Margasira Krishna paksa Astami – the eighth day of the dark fortnight of the month of Margasirsa (falling in December).