Convert Anomalistic Months to Synodic Months
Convert Anomalistic Months (anom.mo) to Synodic Months (syn.mo) instantly and accurately.
Conversion Formula
syn.mo = anom.mo × 0.9330850522
About Anomalistic Months
The anomalistic month = interval between successive Moon perigees = 27.5546 days = 2,380,713.2 s. Slightly longer than the sidereal month because the Moon's perigee precesses, completing one revolution in ~8.85 years. Governs 'supermoons': a full moon at perigee appears ~14% wider and 30% brighter. Tidal forces at perigee are ~30% stronger than at apogee. 1 anom.mo = 27.5546 d.
About Synodic Months
A synodic (lunar) month = new moon to new moon = 29.5306 days = 2,551,442.9 s. Longer than the sidereal month (27.32 d) because Earth advances ~27° in its orbit during that time; the Moon must travel further to realign with the Sun. Islamic Hijri, Hebrew lunisolar, and Chinese calendars are built on synodic months. Eclipses repeat via the Saros cycle (18 yr 11 d = 223 synodic months). 1 syn.mo ≈ 29.5306 d.
Quick Reference Table
| Anomalistic Months (anom.mo) | Synodic Months (syn.mo) |
|---|---|
| 1 anom.mo | 0.933085 syn.mo |
| 2 anom.mo | 1.86617 syn.mo |
| 5 anom.mo | 4.66543 syn.mo |
| 10 anom.mo | 9.33085 syn.mo |
| 25 anom.mo | 23.3271 syn.mo |
| 50 anom.mo | 46.6543 syn.mo |
| 100 anom.mo | 93.3085 syn.mo |