# 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).

### Contents [show][hide]

Switch to reverse conversion:
from year (Julian) to day (sidereal) conversion

### Enter the number in day (sidereal):

Decimal Fraction Exponential Expression
 [d (sidereal)]
eg.: 10.12345 or 1.123e5

Result in year (Julian)

?
 precision 0 1 2 3 4 5 6 7 8 9 [info] Decimal: Exponential:

### Calculation process of conversion value

• 1 day (sidereal) = (86164.09053083288) / (31557600) = 0.002730375267157 year (Julian)
• 1 year (Julian) = (31557600) / (86164.09053083288) = 366.25002139038 day (sidereal)
• ? day (sidereal) × (86164.09053083288  ("s"/"day (sidereal)")) / (31557600  ("s"/"year (Julian)")) = ? year (Julian)

### 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

 Start value: [day (sidereal)] Step size [day (sidereal)] How many lines? (max 100)

visual:
day (sidereal)year (Julian)
00
100.02730375267157
200.054607505343139
300.081911258014709
400.10921501068628
500.13651876335785
600.16382251602942
700.19112626870099
800.21843002137256
900.24573377404413
1000.2730375267157
1100.30034127938727
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## Multiple conversion

Enter numbers in day (sidereal) and click convert button.
One number per line.

Converted numbers in 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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