The basis of the Roman calendar, also referred to as the Christian calendar, is the tropical solar year. For an observer on the Earth, the time taken by the Sun to complete a revolution along the ecliptic with reference to the vernal equinox (the first point of the zodiac sign Aries) is one tropical solar year called as sayana saura varsha according to Indian terminology.<ref name=":2" />
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The basis of the Roman calendar, also referred to as the Christian calendar, is the tropical solar year. For an observer on the Earth, the time taken by the Sun to complete a revolution along the ecliptic with reference to the vernal equinox (the first point of the zodiac sign Aries) is one tropical solar year called as sayana saura varsha according to Indian terminology.<ref name=":2" /> {{#evu:https://www.youtube.com/watch?v=RMj0jb2ktpY&list=PLZ83joYJYmWR8dUgfxbcKFgxbCOaKw91J
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- '''Savana Sauravarsha''' - Its average duration is 365.24219 days. For convenience in civil use, the whole number of this duration - 365 days - is considered normally in year. To account for the residual part - 0.24219th day, Julius Caesar added one extra day once in four years. That year having the extra day is called the Leap year consisting of 366 days.<ref name=":2" />
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- '''Savana Sauravarsha''' - Its average duration is 365.24219 days. For convenience in civil use, the whole number of this duration - 365 days - is considered normally in year. To account for the residual part - 0.24219th day, Julius Caesar added one extra day once in four years. That year having the extra day is called the Leap year consisting of 366 days.<ref name=":2" />