Convert Anomalistic Months to Tropical Years
Convert Anomalistic Months (anom.mo) to Tropical Years (a_trop) instantly and accurately.
Conversion Formula
a_trop = anom.mo × 0.0754418624
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 Tropical Years
The tropical year = time from March equinox to the next = 365.24219 days = 31,556,925.2 s - the year that governs the seasons. The Gregorian 97/400 leap rule approximates it as 365.2425 days, leaving a residual drift of only ~26.8 s/year. The tropical year shortens ~0.53 s per century due to tidal deceleration. Persian Solar Hijri and Mayan Haab' calendars also approximate it. 1 a_trop ≈ 365.24219 d.
Quick Reference Table
| Anomalistic Months (anom.mo) | Tropical Years (a_trop) |
|---|---|
| 1 anom.mo | 0.0754419 a_trop |
| 2 anom.mo | 0.150884 a_trop |
| 5 anom.mo | 0.377209 a_trop |
| 10 anom.mo | 0.754419 a_trop |
| 25 anom.mo | 1.88605 a_trop |
| 50 anom.mo | 3.77209 a_trop |
| 100 anom.mo | 7.54419 a_trop |