To convert sidereal days to months, multiply the value by 0.0327652. To go the other way, multiply months by 30.5202 to get sidereal days.
| Sidereal Days (sid d) | Months (average) (mo) |
|---|---|
| 1 sid d | 0.0327652 mo |
| 2 sid d | 0.0655304 mo |
| 3 sid d | 0.0982955 mo |
| 4 sid d | 0.131061 mo |
| 5 sid d | 0.163826 mo |
| 6 sid d | 0.196591 mo |
| 7 sid d | 0.229356 mo |
| 8 sid d | 0.262121 mo |
| 9 sid d | 0.294887 mo |
| 10 sid d | 0.327652 mo |
| 12 sid d | 0.393182 mo |
| 14 sid d | 0.458712 mo |
| 15 sid d | 0.491478 mo |
| 20 sid d | 0.655304 mo |
| 21 sid d | 0.688069 mo |
| 24 sid d | 0.786364 mo |
| 25 sid d | 0.819129 mo |
| 30 sid d | 0.982955 mo |
| 40 sid d | 1.31061 mo |
| 50 sid d | 1.63826 mo |
| 60 sid d | 1.96591 mo |
| 75 sid d | 2.45739 mo |
| 80 sid d | 2.62121 mo |
| 100 sid d | 3.27652 mo |
| 200 sid d | 6.55304 mo |
| 250 sid d | 8.19129 mo |
| 300 sid d | 9.82955 mo |
| 400 sid d | 13.1061 mo |
| 500 sid d | 16.3826 mo |
| 750 sid d | 24.5739 mo |
| 1,000 sid d | 32.7652 mo |
Sidereal day (sid d). A sidereal day (23 h 56 min 4.09 s) is one rotation of the Earth relative to the stars.
Month (mo). An average Gregorian month is 30.436875 days (1/12 of 365.2425 days).
There are 0.0327652 months in one sidereal day.
Multiply the number of sidereal days by 0.0327652. For example, 10 sidereal days equal 0.327652 months.
One month equals 30.5202 sidereal days.
0.393182 months. Other common values: 5 sidereal days = 0.163826 months and 100 sidereal days = 3.27652 months.