Convert Zeptoseconds to Sidereal Days
Convert Zeptoseconds (zs) to Sidereal Days (sid.d) instantly and accurately.
Conversion Formula
sid.d = zs × 1.160576284e-26
About Zeptoseconds
A zeptosecond (zs) = 10⁻²¹ s. In 2020, physicists at Goethe University Frankfurt measured the H₂ photoionisation time at ~247 zs - the first direct event measurement at this timescale. W-boson lifetime ~300 zs; strong-force quark confinement dynamics ~1-3 zs. These timescales are resolved via the energy-time uncertainty relation and lattice-QCD simulations. 1 zs = 10⁻²¹ s = 1,000 ys.
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.
Quick Reference Table
| Zeptoseconds (zs) | Sidereal Days (sid.d) |
|---|---|
| 1 zs | 1.161 × 10-26 sid.d |
| 2 zs | 2.321 × 10-26 sid.d |
| 5 zs | 5.803 × 10-26 sid.d |
| 10 zs | 1.161 × 10-25 sid.d |
| 25 zs | 2.901 × 10-25 sid.d |
| 50 zs | 5.803 × 10-25 sid.d |
| 100 zs | 1.161 × 10-24 sid.d |