Direct conversion
Convert year (average Gregorian) [yr] to sidereal day [sidereal day] instantly with formula, examples, chart, and FAQs.
1 year (average Gregorian) [yr] = 366.242501 sidereal day [sidereal day]
1 year (average Gregorian) [yr] = 366.242501 sidereal day [sidereal day]
Example: 1 year (average Gregorian) [yr] equals 366.242501 sidereal day [sidereal day].
Time conversions use second as the reference unit. Calendar-style values such as average month and average Gregorian year are approximate by definition.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
A year is a calendar time unit; conversion pages use an average year for fixed calculations.
HistoryYears are based on Earth orbit and are organized through civil calendar systems.
Current useYears are used for age, finance, warranties, education, contracts, planning, and historical timelines.
The sidereal day (sidereal day) is a time unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse sidereal day when comparing time values, checking specifications, converting between systems, or preparing quick estimates.
| year (average Gregorian) [yr] | sidereal day [sidereal day] |
|---|---|
| 1 | 366.242501 |
| 2 | 732.485002 |
| 5 | 1831.212505 |
| 10 | 3662.42501 |
| 20 | 7324.85002 |
| 25 | 9156.062525 |
| 50 | 18312.125049 |
| 100 | 36624.250099 |
| 1000 | 366242.500987 |
Use this formula: 1 year (average Gregorian) [yr] = 366.242501 sidereal day [sidereal day] Enter your value in the calculator and the result updates instantly.
1 year (average Gregorian) [yr] equals 366.242501 sidereal day [sidereal day].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.