Convert Femtoseconds to Sidereal Days
Convert Femtoseconds (fs) to Sidereal Days (sid.d) instantly and accurately.
Conversion Formula
sid.d = fs × 1.160576284e-20
About Femtoseconds
A femtosecond (fs) = 10⁻¹⁵ s - the timescale of molecular vibrations and chemical reactions. Bond stretching: 10-200 fs; bending: 50-500 fs. Ahmed Zewail won the 1999 Nobel Prize in Chemistry for femtochemistry, capturing transition states in real time. Ti:sapphire lasers produce 10-100 fs pulses; LASIK uses 10-100 fs for precise corneal cuts. At 800 nm, one optical cycle = 2.67 fs. Light travels 300 nm in 1 fs. 1 fs = 10⁻¹⁵ s.
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
| Femtoseconds (fs) | Sidereal Days (sid.d) |
|---|---|
| 1 fs | 1.161 × 10-20 sid.d |
| 2 fs | 2.321 × 10-20 sid.d |
| 5 fs | 5.803 × 10-20 sid.d |
| 10 fs | 1.161 × 10-19 sid.d |
| 25 fs | 2.901 × 10-19 sid.d |
| 50 fs | 5.803 × 10-19 sid.d |
| 100 fs | 1.161 × 10-18 sid.d |