time, calendar, and cosmology
What is Adhika Masa (the leap month) and why does it occur?
What the tradition says
The Hindu calendar follows the moon for most of its reckoning. A lunar year runs about eleven days shorter than a solar year. Left alone, the months would slowly drift away from the seasons. To fix this, an extra month is inserted roughly every two and a half to three years. This is Adhika Masa, meaning the added month. It is also known as Mala Masa, sometimes translated as the impure or extra month, and as Purushottama Masa, the month of Purushottama, a name for Vishnu. Puranic tradition, including accounts in the Bhagavata Purana and the Skanda Purana, describes this month as carrying great spiritual merit. Because it belongs to Vishnu himself, prayer, devotion, and reading sacred texts during this time are seen as especially fruitful.
Why it happens
A lunar month is the time from one new moon to the next. Twelve of these fall short of the solar year by around eleven days. Over time that gap adds up. When it reaches a full lunar month, an extra month is added to bring the two calendars back into alignment. This keeps festivals like Diwali and Holi tied to the right seasons year after year. The system has been used across South Asia for a very long time and is shared, in different forms, by several calendar traditions.
Its place in the year
Because Adhika Masa sits outside the regular rhythm of the year, it is treated differently from ordinary months. Most auspicious rites, like weddings, thread ceremonies, and house-warming rituals, are not performed during it. It is seen as a time set apart, not for big life events but for quiet devotion. The name Mala Masa, sometimes read as the month that is left over or unclaimed, reflects this idea. Puranic tradition says the month once had no presiding deity and no merit of its own, until Vishnu took it under his protection and gave it the name Purushottama Masa.
Today
Adhika Masa does not fall in the same position every cycle, and which month is doubled varies. In some years it may be an extra Shravan, in others an extra Bhadrapada. This means the timing shifts and not every region marks it in exactly the same way. Many Hindus around the world, even those far from their home communities, observe it as a period of extra prayer and reading. Temples often hold special programmes during this month. For those following a Hindu calendar, the arrival of Adhika Masa is a clear sign of how carefully the tradition has always tried to keep cosmic, natural, and religious time in balance.