Convert Planck Time to Sidereal Days
Convert Planck Time (t_P) to Sidereal Days (sid.d) instantly and accurately.
Conversion Formula
sid.d = t_P × 6.256953411e-49
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.
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
| Planck Time (t_P) | Sidereal Days (sid.d) |
|---|---|
| 1 t_P | 6.257 × 10-49 sid.d |
| 2 t_P | 1.251 × 10-48 sid.d |
| 5 t_P | 3.128 × 10-48 sid.d |
| 10 t_P | 6.257 × 10-48 sid.d |
| 25 t_P | 1.564 × 10-47 sid.d |
| 50 t_P | 3.128 × 10-47 sid.d |
| 100 t_P | 6.257 × 10-47 sid.d |