Convert Anomalistic Months to Draconic Months
Convert Anomalistic Months (anom.mo) to Draconic Months (drac.mo) instantly and accurately.
Conversion Formula
drac.mo = anom.mo × 1.012580048
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 Draconic Months
The draconic (nodical) month = 27.2122 days = 2,351,135.8 s - the interval between successive Moon passages through the same orbital node. Named from the Latin 'draco' (dragon): eclipses only occur near the nodes, where the Moon can align with the Sun or Earth's shadow. The Saros cycle (18 yr 11 d) equals ~242 draconic months, enabling eclipse sequence forecasting. 1 drac.mo = 27.2122 d.
Quick Reference Table
| Anomalistic Months (anom.mo) | Draconic Months (drac.mo) |
|---|---|
| 1 anom.mo | 1.01258 drac.mo |
| 2 anom.mo | 2.02516 drac.mo |
| 5 anom.mo | 5.0629 drac.mo |
| 10 anom.mo | 10.1258 drac.mo |
| 25 anom.mo | 25.3145 drac.mo |
| 50 anom.mo | 50.629 drac.mo |
| 100 anom.mo | 101.258 drac.mo |