To convert months to sidereal days, multiply the value by 30.5202. To go the other way, multiply sidereal days by 0.0327652 to get months.
| Months (average) (mo) | Sidereal Days (sid d) |
|---|---|
| 1 mo | 30.5202 sid d |
| 2 mo | 61.0404 sid d |
| 3 mo | 91.5606 sid d |
| 4 mo | 122.081 sid d |
| 5 mo | 152.601 sid d |
| 6 mo | 183.121 sid d |
| 7 mo | 213.641 sid d |
| 8 mo | 244.162 sid d |
| 9 mo | 274.682 sid d |
| 10 mo | 305.202 sid d |
| 12 mo | 366.243 sid d |
| 14 mo | 427.283 sid d |
| 15 mo | 457.803 sid d |
| 20 mo | 610.404 sid d |
| 21 mo | 640.924 sid d |
| 24 mo | 732.485 sid d |
| 25 mo | 763.005 sid d |
| 30 mo | 915.606 sid d |
| 40 mo | 1,220.81 sid d |
| 50 mo | 1,526.01 sid d |
| 60 mo | 1,831.21 sid d |
| 75 mo | 2,289.02 sid d |
| 80 mo | 2,441.62 sid d |
| 100 mo | 3,052.02 sid d |
| 200 mo | 6,104.04 sid d |
| 250 mo | 7,630.05 sid d |
| 300 mo | 9,156.06 sid d |
| 400 mo | 12,208.1 sid d |
| 500 mo | 15,260.1 sid d |
| 750 mo | 22,890.2 sid d |
| 1,000 mo | 30,520.2 sid d |
Month (mo). An average Gregorian month is 30.436875 days (1/12 of 365.2425 days).
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 30.5202 sidereal days in one month.
Multiply the number of months by 30.5202. For example, 10 months equal 305.202 sidereal days.
One sidereal day equals 0.0327652 months.
366.243 sidereal days. Other common values: 5 months = 152.601 sidereal days and 100 months = 3,052.02 sidereal days.