Convert Gregorian Years to Anomalistic Months
Convert Gregorian Years (yr) to Anomalistic Months (anom.mo) instantly and accurately.
Conversion Formula
anom.mo = yr × 13.25525135
About Gregorian Years
The Gregorian year = exactly 365.2425 days = 31,556,952 s (mean over the 400-year cycle with 97 leap years). The Julian calendar (45 BCE) used 365.25 days; Gregorian reform (1582) dropped 10 days and amended the centennial rule. Britain adopted it in 1752; Greece in 1923. Carbon-14 dates are reported in 'years BP' (before 1950 CE). 1 yr = 365.2425 d = 8,765.82 h = 31,556,952 s.
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.
Quick Reference Table
| Gregorian Years (yr) | Anomalistic Months (anom.mo) |
|---|---|
| 1 yr | 13.2553 anom.mo |
| 2 yr | 26.5105 anom.mo |
| 5 yr | 66.2763 anom.mo |
| 10 yr | 132.553 anom.mo |
| 25 yr | 331.381 anom.mo |
| 50 yr | 662.763 anom.mo |
| 100 yr | 1325.53 anom.mo |