Indian Calendar - An Introduction

The western calendar is based on the sun, in which a year is the time required for the earth to complete one orbit around the sun. This precisely measures 365 days 5 hours 48 minutes and 46 seconds. The Indian calender is ingeniously based on both the sun and the moon; it uses a solar year but divides it into 12 lunar months. A lunar month is precisely 29 days 12 hours 44 minutes and 3 seconds long. Twelve such months constitute a lunar year of 354 days 8 hours 48 minutes and 36 seconds. To help the lunar months coincide with the solar year, the practice of inserting an intercalary (extra) month arose. So 60 solar months = 62 lunar months. Hence an extra month, called the Adhik Mas, is inserted every 30 months i.e. every 2.5 years.

2017

January

February

March

April

May

June

July

August

September

October

November

December

Life Time Calendar