Convert Sidereal Days to Yoctoseconds
Convert Sidereal Days (sid.d) to Yoctoseconds (ys) instantly and accurately.
Conversion Formula
ys = sid.d × 8.616409050e+28
About Sidereal Days
A sidereal day = Earth's rotation period relative to the stars = 23 h 56 min 4.0905 s = 86,164.0905 s - ~3 min 56 s shorter than the 24 h solar day because Earth advances ~1° in its orbit each day. Equatorial telescope mounts rotate at one turn per sidereal day to track stars. VLBI, GPS orbit determination, and polar-motion monitoring use sidereal rotation as their reference. 1 sid. day = 86,164.0905 s.
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 Days (sid.d) | Yoctoseconds (ys) |
|---|---|
| 1 sid.d | 8.616 × 1028 ys |
| 2 sid.d | 1.723 × 1029 ys |
| 5 sid.d | 4.308 × 1029 ys |
| 10 sid.d | 8.616 × 1029 ys |
| 25 sid.d | 2.154 × 1030 ys |
| 50 sid.d | 4.308 × 1030 ys |
| 100 sid.d | 8.616 × 1030 ys |