Convert Synodic Months to Megayears
Convert Synodic Months (syn.mo) to Megayears (Ma) instantly and accurately.
Conversion Formula
Ma = syn.mo × 8.085200614e-8
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.
About Megayears
A megayear (1 Ma) = 10⁶ yr ≈ 3.156 × 10¹³ s - the timescale of geology and tectonic evolution. The K-Pg mass extinction at 66.0 Ma; Cambrian explosion ~538.8 Ma; Great Oxygenation Event ~2,400 Ma. Plate motion at 2-10 cm/yr = 200-1,000 km per Ma (Atlantic ~3,000 km wider since Pangaea rifting ~200 Ma ago). Background extinction rate measured in extinctions per million species-years. 1 Ma = 10⁶ yr.
Quick Reference Table
| Synodic Months (syn.mo) | Megayears (Ma) |
|---|---|
| 1 syn.mo | 8.085 × 10-8 Ma |
| 2 syn.mo | 1.617 × 10-7 Ma |
| 5 syn.mo | 4.043 × 10-7 Ma |
| 10 syn.mo | 8.085 × 10-7 Ma |
| 25 syn.mo | 2.021 × 10-6 Ma |
| 50 syn.mo | 4.043 × 10-6 Ma |
| 100 syn.mo | 8.085 × 10-6 Ma |