Convert Synodic Months to Centuries
Convert Synodic Months (syn.mo) to Centuries (cent) instantly and accurately.
Conversion Formula
cent = syn.mo × 0.0008085200614
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 Centuries
A century = exactly 100 Gregorian years ≈ 3.156 × 10⁹ s. Standard unit of historical periodisation (the 20th century, the 18th-century Enlightenment). IPCC projects warming and sea-level rise on century timescales. Precession of the equinoxes advances ~1.39°/century, so zodiac constellations no longer match their named seasons. Ice-core and radiocarbon records are commonly displayed at century resolution. 1 century = 100 yr.
Quick Reference Table
| Synodic Months (syn.mo) | Centuries (cent) |
|---|---|
| 1 syn.mo | 0.00080852 cent |
| 2 syn.mo | 0.00161704 cent |
| 5 syn.mo | 0.0040426 cent |
| 10 syn.mo | 0.0080852 cent |
| 25 syn.mo | 0.020213 cent |
| 50 syn.mo | 0.040426 cent |
| 100 syn.mo | 0.080852 cent |