day (sidereal) to year (Julian) conversion

Conversion number between day (sidereal) [d (sidereal)] and year (Julian) [a, y, or yr] is 0.002730375267157. This means, that day (sidereal) is smaller unit than year (Julian).

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from year (Julian) to day (sidereal) conversion

Enter the number in day (sidereal):

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[d (sidereal)]
eg.: 10.12345 or 1.123e5

Result in year (Julian)

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High precision conversion

If conversion between day (sidereal) to second and second to year (Julian) is exactly definied, high precision conversion from day (sidereal) to year (Julian) is enabled.

Since definition contain rounded number(s) too, there is no sense for high precision calculation, but if you want, you can enable it. Keep in mind, that converted number will be inaccurate due this rounding error!


day (sidereal) to year (Julian) conversion chart

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day (sidereal)year (Julian)
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Details about day (sidereal) and year (Julian) units:

Convert Day (sidereal) to other unit:

day (sidereal)

Definition of day (sidereal) unit: ≈ 23 h, 56 min, 4.0916 sec. A sidereal day is the time needed for the Earth to rotate once around its axis so that the distant stars appear in the same position in the sky. This is ~4 minutes shorter than the solar day.

Convert Year (Julian) to other unit:

year (Julian)

Definition of year (Julian) unit: = 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.

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