Amavasya, also referred as Amavasi or Amavas, is the no moon day in a month in a traditional Hindu lunar calendar. Amavasya May 2015 date is May 18. The Amavasya Time - begins at 11:10 AM on May 17, 2015 and ends at 9:29 AM on May 18. As the Amavasya ends on May 18 - the day is marked as Somvati Amavasya. Somvati Amavasya time is from sunrise to 9:29 AM on May 18.
Shani Jayanti is observed on the day.
Vat Savitri Amavasya Vrat is also observed on the day in North India.As per traditional North Indian calendar it is the Amavasya in Jyeshta month. In other regions it is the Vaishakh Amavasi.
Amavasi is the darkest day in a traditional Hindu month and is considered both auspicious and inauspicious by different Hindu communities.
There are many Hindus who undertake a fast on Amavasi. Some devotees only take a single meal on the day.
Vaishakh month ends in traditional calendars followed in Maharashtra,
Gujarat, Andhra Pradesh and Karnataka on the day.