Convert Sidereal Days to Planck Time
Convert Sidereal Days (sid.d) to Planck Time (t_P) instantly and accurately.
Conversion Formula
t_P = sid.d × 1.598221905e+48
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 Planck Time
The Planck time (t_P) = √(ℏG/c⁵) ≈ 5.391 × 10⁻⁴⁴ s — the time for light to travel one Planck length (~1.616 × 10⁻³⁵ m). Below this scale, general relativity and quantum mechanics both break down; a theory of quantum gravity is needed. No physical process or instrument approaches this timescale — it is a theoretical lower bound. Introduced by Max Planck in 1899. 1 t_P ≈ 5.391 × 10⁻⁴⁴ s.
Quick Reference Table
| Sidereal Days (sid.d) | Planck Time (t_P) |
|---|---|
| 1 sid.d | 1.598 × 1048 t_P |
| 2 sid.d | 3.196 × 1048 t_P |
| 5 sid.d | 7.991 × 1048 t_P |
| 10 sid.d | 1.598 × 1049 t_P |
| 25 sid.d | 3.996 × 1049 t_P |
| 50 sid.d | 7.991 × 1049 t_P |
| 100 sid.d | 1.598 × 1050 t_P |