To convert sidereal days to years, multiply the value by 0.00273043. To go the other way, multiply years by 366.243 to get sidereal days.
| Sidereal Days (sid d) | Years (average) (yr) |
|---|---|
| 1 sid d | 0.00273043 yr |
| 5 sid d | 0.0136522 yr |
| 10 sid d | 0.0273043 yr |
| 25 sid d | 0.0682608 yr |
| 50 sid d | 0.136522 yr |
| 100 sid d | 0.273043 yr |
| 250 sid d | 0.682608 yr |
| 500 sid d | 1.36522 yr |
| 1,000 sid d | 2.73043 yr |
| 2,500 sid d | 6.82608 yr |
| 5,000 sid d | 13.6522 yr |
| 10,000 sid d | 27.3043 yr |
| 100,000 sid d | 273.043 yr |
| 1,000,000 sid d | 2,730.43 yr |
Sidereal day (sid d). A sidereal day (23 h 56 min 4.09 s) is one rotation of the Earth relative to the stars.
Year (yr). An average Gregorian year is 365.2425 days, allowing for leap years.
There are 0.00273043 years in one sidereal day.
Multiply the number of sidereal days by 0.00273043. For example, 10 sidereal days equal 0.0273043 years.
One year equals 366.243 sidereal days.
2.73043 years. Other common values: 100 sidereal days = 0.273043 years and 10,000 sidereal days = 27.3043 years.