Year (Julian) is time unit, symbol: [a, y, or yr]. Definition of 1 year (Julian) = 365.25 d average. The basic calendar year has 365 days, but in fact the Earth needs a little more time around the sun. The Julian calendar compensated this with leap year (every fourth year had 366 days). According to the formula, a Julian year has 365 + 1/4 = 365.25 days. But even with this compensation, the astronomical year slip 0.78 days every 100 years into real seasons. Therefore, most countries have moved to the Gregorian calendar introduced in 1582.. Compared to second, year (Julian) is bigger unit.
• 1 [a, y, or yr] = (exactly) `31557600` [s]
• 1 [s] = (exactly) `1/(31557600)` [a, y, or yr] = 3.1688087814029 × 10-8 [a, y, or yr]
Multiply convert of year (Julian) to common time units:[a, y, or yr]
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Evan M Manning, 1997, How Many Days Are in a Year? Nasa.gov, page 2, table 1.. http://pumas.jpl.nasa.gov/file...