Convert Yoctoseconds to Sidereal Years
Convert Yoctoseconds (ys) to Sidereal Years (a_sid) instantly and accurately.
Conversion Formula
a_sid = ys × 3.168753579e-32
About Yoctoseconds
A yoctosecond (ys) = 10⁻²⁴ s - the smallest named SI prefix time unit. Light travels ~0.3 fm in 1 ys, about one-tenth the proton charge radius. Strong-force quark binding operates on ~1 ys timescales; W and Z boson lifetimes are ~260-290 ys. Lead-lead collisions at the LHC produce quark-gluon plasma that thermalises within a few ys. These timescales are inferred from decay widths via ΔE × Δt ≥ ℏ. 1 ys = 10⁻²⁴ s.
About Sidereal Years
The sidereal year = Earth's orbital period relative to the stars = 365.25636 days = 31,558,149.8 s - about 20 min 24 s longer than the tropical year. The gap arises from precession of the equinoxes (~50 arcsec/year westward drift), which causes the tropical year to end slightly before the sidereal orbit completes. JPL DE440 ephemerides and J2000.0 epoch are anchored to the sidereal frame. 1 a_sid = 365.25636 d.
Quick Reference Table
| Yoctoseconds (ys) | Sidereal Years (a_sid) |
|---|---|
| 1 ys | 3.169 × 10-32 a_sid |
| 2 ys | 6.338 × 10-32 a_sid |
| 5 ys | 1.584 × 10-31 a_sid |
| 10 ys | 3.169 × 10-31 a_sid |
| 25 ys | 7.922 × 10-31 a_sid |
| 50 ys | 1.584 × 10-30 a_sid |
| 100 ys | 3.169 × 10-30 a_sid |