Difference Between Calender and Panchang-Why?

In modern Gregorian calender there is a leap year after a regular interval of 4 years and after 100 years this leap year does not come and after 400 years it comes again. This article details that in this way the year is of 365.2425 days. The value of Nirayan year is 365.2563, which istheduration of re entry of Sun in one sign.It also points out the difference between Nirayan and Sayan year.

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