Vrata is a part of Naimittika, or voluntary karma. It is that which is the cause of virtue (punya), and is done to achieve its fruit. Vrata are of various kinds. Some of the chief are Janmashtami on Krishna's birthday; Shiva-ratri in honour of Shiva; and the Shat-panchami, Durvashtami, Tala-navami. Ananta-chaturdashi performed at specified times in honour of Lakshmi, Narayana, and Ananta. Others may be performed at any time, such as the Savitri vrata by women only, and the Karttikeya-puja by men only. The great vrata is the celebrated Durga-puja, maha-vrata in honour of the Devi as Durga, which will continue as long as the sun and moon endure, and which, if once commenced, must always be continued. There are numerous other vrata which have developed to a great extent in Bengal, and for which there is no Shastric authority such as Madhu-sankranti-vrata, Jala-sankranti-vrata, and others. While each vrata has its peculiarities, certain features are common to vrata of differing kinds. There is both in preparation and performance sangyama, such as sexual continence, eating of particular food, such as havishyanna, fasting, bathing. No flesh or fish are taken. The mind is concentrated to its purposes, and the vow or resolution (niyama) is taken. Before the vrata the Sun, Planets, and Kula-devata are worshipped, and by the "suryahsomoyamahkala" mantra all Deva and Beings are invoked to the side of the worshipper. In the vaidika vrata the sangkalpa is made in the morning, and the vrata is done before midday.