To convert years to sidereal days, multiply the value by 366.243. To go the other way, multiply sidereal days by 0.00273043 to get years.
| Years (average) (yr) | Sidereal Days (sid d) |
|---|---|
| 1 yr | 366.243 sid d |
| 2 yr | 732.485 sid d |
| 3 yr | 1,098.73 sid d |
| 4 yr | 1,464.97 sid d |
| 5 yr | 1,831.21 sid d |
| 6 yr | 2,197.46 sid d |
| 7 yr | 2,563.7 sid d |
| 8 yr | 2,929.94 sid d |
| 9 yr | 3,296.18 sid d |
| 10 yr | 3,662.43 sid d |
| 12 yr | 4,394.91 sid d |
| 14 yr | 5,127.4 sid d |
| 15 yr | 5,493.64 sid d |
| 20 yr | 7,324.85 sid d |
| 21 yr | 7,691.09 sid d |
| 24 yr | 8,789.82 sid d |
| 25 yr | 9,156.06 sid d |
| 30 yr | 10,987.3 sid d |
| 40 yr | 14,649.7 sid d |
| 50 yr | 18,312.1 sid d |
| 60 yr | 21,974.6 sid d |
| 75 yr | 27,468.2 sid d |
| 80 yr | 29,299.4 sid d |
| 100 yr | 36,624.3 sid d |
| 200 yr | 73,248.5 sid d |
| 250 yr | 91,560.6 sid d |
| 300 yr | 109,873 sid d |
| 400 yr | 146,497 sid d |
| 500 yr | 183,121 sid d |
| 750 yr | 274,682 sid d |
| 1,000 yr | 366,243 sid d |
Year (yr). An average Gregorian year is 365.2425 days, allowing for leap years.
Sidereal day (sid d). A sidereal day (23 h 56 min 4.09 s) is one rotation of the Earth relative to the stars.
There are 366.243 sidereal days in one year.
Multiply the number of years by 366.243. For example, 10 years equal 3,662.43 sidereal days.
One sidereal day equals 0.00273043 years.
4,394.91 sidereal days. Other common values: 5 years = 1,831.21 sidereal days and 100 years = 36,624.3 sidereal days.