Convert Planck Time to Sidereal Years
Convert Planck Time (t_P) to Sidereal Years (a_sid) instantly and accurately.
Conversion Formula
a_sid = t_P × 1.708353323e-51
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 Years
The sidereal year = Earth's orbital period relative to the stars = 365.25636 days = 31,558,149.8 s - about 20 min 24 s longer than the tropical year. The gap arises from precession of the equinoxes (~50 arcsec/year westward drift), which causes the tropical year to end slightly before the sidereal orbit completes. JPL DE440 ephemerides and J2000.0 epoch are anchored to the sidereal frame. 1 a_sid = 365.25636 d.
Quick Reference Table
| Planck Time (t_P) | Sidereal Years (a_sid) |
|---|---|
| 1 t_P | 1.708 × 10-51 a_sid |
| 2 t_P | 3.417 × 10-51 a_sid |
| 5 t_P | 8.542 × 10-51 a_sid |
| 10 t_P | 1.708 × 10-50 a_sid |
| 25 t_P | 4.271 × 10-50 a_sid |
| 50 t_P | 8.542 × 10-50 a_sid |
| 100 t_P | 1.708 × 10-49 a_sid |