Convert Tropical Years to Decades
Convert Tropical Years (a_trop) to Decades (dec) instantly and accurately.
Conversion Formula
dec = a_trop × 0.09999991512
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.
About Decades
A decade = exactly 10 Gregorian years = 315,569,520 s. Climate scientists compute 10-year running means to remove interannual variability; IPCC reports compare decadal temperature anomalies. Moore's Law predicted ~10× transistor density increase per decade. US Census counts are constitutionally mandated each decade. Cultural periods are colloquially labelled by decade (the 1960s, the 1980s). 1 decade = 10 yr.
Quick Reference Table
| Tropical Years (a_trop) | Decades (dec) |
|---|---|
| 1 a_trop | 0.0999999 dec |
| 2 a_trop | 0.2 dec |
| 5 a_trop | 0.5 dec |
| 10 a_trop | 0.999999 dec |
| 25 a_trop | 2.5 dec |
| 50 a_trop | 5 dec |
| 100 a_trop | 9.99999 dec |