Convert Sidereal Years to Weeks
Convert Sidereal Years (a_sid) to Weeks (wk) instantly and accurately.
Conversion Formula
wk = a_sid × 52.17948043
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.
About Weeks
A week (wk) = exactly 7 days = 604,800 s. The 7-day week derives from Babylonian astronomy assigning one of the seven classical celestial bodies to each day - preserved in English (Sun-day, Mon-day, Satur-day) and Romance language day names. It spread globally via Jewish, Christian, and Islamic calendars. ISO 8601 numbers weeks 1-52(53) with Monday as day 1. 365-day years contain 52 weeks + 1 day. 1 wk = 7 d = 604,800 s.
Quick Reference Table
| Sidereal Years (a_sid) | Weeks (wk) |
|---|---|
| 1 a_sid | 52.1795 wk |
| 2 a_sid | 104.359 wk |
| 5 a_sid | 260.897 wk |
| 10 a_sid | 521.795 wk |
| 25 a_sid | 1304.49 wk |
| 50 a_sid | 2608.97 wk |
| 100 a_sid | 5217.95 wk |