Maha Shivaratri is the one major observance of the Hindu year that is deliberately nocturnal. Almost everything else is done at sunrise or midday. This one is kept awake, through the dark, in four parts.
When it falls, in the terms the tradition actually uses
Maha Shivaratri falls on the Chaturdashi of Krishna paksha — the fourteenth tithi of the waning half — in the lunar month of Phalguna. Some regional reckonings place it in Magha; the difference is one of month-naming convention rather than of astronomy, and both land on the same night.
That is a tithi, not a date. It is the second-darkest night of the month, immediately before the new moon, and the darkness is the point rather than an inconvenience. If you want to know why a tithi does not map cleanly onto a calendar day, what a tithi is sets that out. AdiVeda does not publish festival dates — take those from a panchang that states its conventions.
The four watches
The night is divided into four praharas, roughly three hours each, and the classical observance performs an abhisheka in each one — traditionally with milk, curd, ghee and honey, and in many traditions with water and bilva leaves throughout.
Two things are worth noticing about that structure. It makes the observance an act of staying rather than of attending: you cannot do four watches by turning up once. And it is the only major Hindu observance built around a vigil, jagarana, where wakefulness itself is the offering.
Why this night, and why the answers differ
The tradition gives several accounts, and they are genuinely different rather than variations of one. Honesty is better here than a tidy single story.
- Lingodbhava — Shiva appearing as the pillar of light whose top and bottom Brahma and Vishnu could not find. This is the account most closely tied to Shivaratri in temple practice, and the Lingodbhava image is installed and worshipped on this night in South Indian temples. The narrative is on the pillar of light.
- The drinking of the Halahala — the night Shiva held the poison in his throat. Told on Neelkanth.
- The marriage of Shiva and Parvati — kept in several regions. See the divine wedding.
- The tandava — the night of the cosmic dance, in Tamil Shaiva tradition. See Nataraja.
No single one of these is the reason. Different regions keep different accounts, and a page that picked one and suppressed the rest would be misrepresenting the tradition rather than clarifying it.
What is recited
All of these are published in full on AdiVeda, with Devanagari, transliteration and translation:
- Rudrāṣṭakam — Tulsidas's eight verses to Rudra, and the most widely recited Shivaratri text in the Hindi-speaking regions.
- Liṅgāṣṭakam — eight verses to the linga, sung during abhisheka.
- Shiva Tāṇḍava Stotram — attributed to Ravana, and the most metrically demanding of the set.
- Shiv Chalisa — the forty verses, for those who want something to hold the whole night.
- Shiva mantras — including the Panchakshara and the Mahamrityunjaya.
The fast
Most observers keep a fast through the day and the night, breaking it the following morning. Practice varies from nirjala (without water) through fruit-and-milk to a single evening meal, and the tradition does not impose one standard. What is consistent is that the fast supports the vigil rather than being the observance itself.
Where this comes from
The Shivaratri observance is described in the Śiva Purāṇa and the Skanda Purāṇa, which also carry the associated narratives. The four-watch abhisheka is set out in the Śiva Purāṇa. The regional variation in which account is attached to the night is a matter of living tradition, not of textual disagreement, and this page reports it rather than resolving it.