To convert days to sidereal years, multiply the value by 0.0027378. To go the other way, multiply sidereal years by 365.256 to get days.
| Days (d) | Sidereal Years (sid yr) |
|---|---|
| 1 d | 0.0027378 sid yr |
| 5 d | 0.013689 sid yr |
| 10 d | 0.027378 sid yr |
| 25 d | 0.0684451 sid yr |
| 50 d | 0.13689 sid yr |
| 100 d | 0.27378 sid yr |
| 250 d | 0.684451 sid yr |
| 500 d | 1.3689 sid yr |
| 1,000 d | 2.7378 sid yr |
| 2,500 d | 6.84451 sid yr |
| 5,000 d | 13.689 sid yr |
| 10,000 d | 27.378 sid yr |
| 100,000 d | 273.78 sid yr |
| 1,000,000 d | 2,737.8 sid yr |
Day (d). A day is 24 hours (86,400 seconds).
Sidereal year (sid yr). A sidereal year is 365.256363 days, one orbit of the Sun relative to the stars.
There are 0.0027378 sidereal years in one day.
Multiply the number of days by 0.0027378. For example, 10 days equal 0.027378 sidereal years.
One sidereal year equals 365.256 days.
2.7378 sidereal years. Other common values: 100 days = 0.27378 sidereal years and 10,000 days = 27.378 sidereal years.