Convert Gregorian Years to Attoseconds
Convert Gregorian Years (yr) to Attoseconds (as) instantly and accurately.
Conversion Formula
as = yr × 3.155695200e+25
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 Attoseconds
An attosecond (as) = 10⁻¹⁸ s - the timescale of electron dynamics in atoms. The Bohr-model orbital period in hydrogen is ~152 as. Electron tunnelling through atomic potential barriers takes a few hundred as. The 2023 Nobel Prize in Physics (Agostini, Krausz, L'Huillier) honoured methods for generating sub-100 as pulses via high-harmonic generation in Ti:sapphire lasers. 1 as = 10⁻¹⁸ s = 1,000 zs.
Quick Reference Table
| Gregorian Years (yr) | Attoseconds (as) |
|---|---|
| 1 yr | 3.156 × 1025 as |
| 2 yr | 6.311 × 1025 as |
| 5 yr | 1.578 × 1026 as |
| 10 yr | 3.156 × 1026 as |
| 25 yr | 7.889 × 1026 as |
| 50 yr | 1.578 × 1027 as |
| 100 yr | 3.156 × 1027 as |