Convert Sidereal Days to Attoseconds
Convert Sidereal Days (sid.d) to Attoseconds (as) instantly and accurately.
Conversion Formula
as = sid.d × 8.616409050e+22
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 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
| Sidereal Days (sid.d) | Attoseconds (as) |
|---|---|
| 1 sid.d | 8.616 × 1022 as |
| 2 sid.d | 1.723 × 1023 as |
| 5 sid.d | 4.308 × 1023 as |
| 10 sid.d | 8.616 × 1023 as |
| 25 sid.d | 2.154 × 1024 as |
| 50 sid.d | 4.308 × 1024 as |
| 100 sid.d | 8.616 × 1024 as |