To convert sidereal years to months, multiply the value by 12.0005. To go the other way, multiply months by 0.0833302 to get sidereal years.
| Sidereal Years (sid yr) | Months (average) (mo) |
|---|---|
| 1 sid yr | 12.0005 mo |
| 2 sid yr | 24.0009 mo |
| 3 sid yr | 36.0014 mo |
| 4 sid yr | 48.0018 mo |
| 5 sid yr | 60.0023 mo |
| 6 sid yr | 72.0027 mo |
| 7 sid yr | 84.0032 mo |
| 8 sid yr | 96.0036 mo |
| 9 sid yr | 108.004 mo |
| 10 sid yr | 120.005 mo |
| 12 sid yr | 144.005 mo |
| 14 sid yr | 168.006 mo |
| 15 sid yr | 180.007 mo |
| 20 sid yr | 240.009 mo |
| 21 sid yr | 252.01 mo |
| 24 sid yr | 288.011 mo |
| 25 sid yr | 300.011 mo |
| 30 sid yr | 360.014 mo |
| 40 sid yr | 480.018 mo |
| 50 sid yr | 600.023 mo |
| 60 sid yr | 720.027 mo |
| 75 sid yr | 900.034 mo |
| 80 sid yr | 960.036 mo |
| 100 sid yr | 1,200.05 mo |
| 200 sid yr | 2,400.09 mo |
| 250 sid yr | 3,000.11 mo |
| 300 sid yr | 3,600.14 mo |
| 400 sid yr | 4,800.18 mo |
| 500 sid yr | 6,000.23 mo |
| 750 sid yr | 9,000.34 mo |
| 1,000 sid yr | 12,000.5 mo |
Sidereal year (sid yr). A sidereal year is 365.256363 days, one orbit of the Sun relative to the stars.
Month (mo). An average Gregorian month is 30.436875 days (1/12 of 365.2425 days).
There are 12.0005 months in one sidereal year.
Multiply the number of sidereal years by 12.0005. For example, 10 sidereal years equal 120.005 months.
One month equals 0.0833302 sidereal years.
144.005 months. Other common values: 5 sidereal years = 60.0023 months and 100 sidereal years = 1,200.05 months.