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Keeping night vigil, doing Japa and meditation are greatly meritorious.
Rashtriya Vigyan Diwas 
One who observes this Vrata and keeps night vigil near an Indian gooseberry tree and circumambulates it is absolved of all sins and gets the fruit of donating 1,000 cows.
Chhatrapati Shivaji Jayanti
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Dwapar Yugadi Tithi

Mahashivaratri Vrata: Night vigil and worship of Shiva (Midnight from 12.28 to 1.18), Vishnupadi Sankranti (Meritorious period: From sunrise to 12.53 p.m.)

(See the calendar or diary for detailed information)         
Night vigil and worship of Shiva (Midnight from 12.28 to 1.18)
Those, who observe this Vrata get success in this world and get the inexhaustible other world (i.e. they live permanently in heaven.)