To convert years to sidereal years, multiply the value by 0.999962. To go the other way, multiply sidereal years by 1.00004 to get years.
| Years (average) (yr) | Sidereal Years (sid yr) |
|---|---|
| 1 yr | 0.999962 sid yr |
| 2 yr | 1.99992 sid yr |
| 3 yr | 2.99989 sid yr |
| 4 yr | 3.99985 sid yr |
| 5 yr | 4.99981 sid yr |
| 6 yr | 5.99977 sid yr |
| 7 yr | 6.99973 sid yr |
| 8 yr | 7.9997 sid yr |
| 9 yr | 8.99966 sid yr |
| 10 yr | 9.99962 sid yr |
| 12 yr | 11.9995 sid yr |
| 14 yr | 13.9995 sid yr |
| 15 yr | 14.9994 sid yr |
| 20 yr | 19.9992 sid yr |
| 21 yr | 20.9992 sid yr |
| 24 yr | 23.9991 sid yr |
| 25 yr | 24.9991 sid yr |
| 30 yr | 29.9989 sid yr |
| 40 yr | 39.9985 sid yr |
| 50 yr | 49.9981 sid yr |
| 60 yr | 59.9977 sid yr |
| 75 yr | 74.9972 sid yr |
| 80 yr | 79.997 sid yr |
| 100 yr | 99.9962 sid yr |
| 200 yr | 199.992 sid yr |
| 250 yr | 249.991 sid yr |
| 300 yr | 299.989 sid yr |
| 400 yr | 399.985 sid yr |
| 500 yr | 499.981 sid yr |
| 750 yr | 749.972 sid yr |
| 1,000 yr | 999.962 sid yr |
Year (yr). An average Gregorian year is 365.2425 days, allowing for leap years.
Sidereal year (sid yr). A sidereal year is 365.256363 days, one orbit of the Sun relative to the stars.
There are 0.999962 sidereal years in one year.
Multiply the number of years by 0.999962. For example, 10 years equal 9.99962 sidereal years.
One sidereal year equals 1.00004 years.
11.9995 sidereal years. Other common values: 5 years = 4.99981 sidereal years and 100 years = 99.9962 sidereal years.