Convert Sidereal Years to Yoctoseconds
Convert Sidereal Years (a_sid) to Yoctoseconds (ys) instantly and accurately.
Conversion Formula
ys = a_sid × 3.155814976e+31
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.
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.
Quick Reference Table
| Sidereal Years (a_sid) | Yoctoseconds (ys) |
|---|---|
| 1 a_sid | 3.156 × 1031 ys |
| 2 a_sid | 6.312 × 1031 ys |
| 5 a_sid | 1.578 × 1032 ys |
| 10 a_sid | 3.156 × 1032 ys |
| 25 a_sid | 7.89 × 1032 ys |
| 50 a_sid | 1.578 × 1033 ys |
| 100 a_sid | 3.156 × 1033 ys |