Hour (Sidereal) to Femtosecond Converter
Unit Converter
Instant · Precise · Universal
28 units available
6 categories total
How to Convert Hour (Sidereal) to Femtosecond
To convert sidereal hours to solar seconds: multiply by 3,590.17. To solar hours: multiply by 0.99727.
1 sidereal hour = 3,590.17 solar seconds ≈ 59 min 50.17 s in solar time. 24 sidereal hours = 1 sidereal day.
For example, 1 Hour (Sidereal) (h (Sid)) = 3.590170e+18 Femtosecond (fs).
Hour (Sidereal) to Femtosecond — Common Values
| Hour (Sidereal) (h (Sid)) | Femtosecond (fs) |
|---|---|
| 0.1 | 3.590170e+17 |
| 0.5 | 1.795085e+18 |
| 1 | 3.590170e+18 |
| 2 | 7.180341e+18 |
| 5 | 1.795085e+19 |
| 10 | 3.590170e+19 |
| 25 | 8.975426e+19 |
| 50 | 1.795085e+20 |
| 100 | 3.590170e+20 |
| 500 | 1.795085e+21 |
| 1000 | 3.590170e+21 |
About Hour (Sidereal) (h (Sid))
Definition
The sidereal hour is 1/24 of a sidereal day — approximately 3,590.17 seconds (59 minutes and 50.17 seconds in solar time).
Mathematical Relationship
1 sidereal hour = 3,590.17 solar seconds ≈ 59 min 50.17 s in solar time. 24 sidereal hours = 1 sidereal day.
Conversion Formula
To convert sidereal hours to solar seconds: multiply by 3,590.17. To solar hours: multiply by 0.99727.
Practical Applications
Right ascension in celestial coordinates is measured in hours (0–24 h of sidereal time), directly using sidereal hours.
Interesting Facts
Right ascension is measured in hours: 1 h of RA = 15° of sky. The entire sky is 24 sidereal hours in rotation.
Common Mistakes
Treating sidereal hours as exactly 60 solar minutes. The ~10-second difference matters for precision tracking.
Educational Tips
If you use a star-tracking telescope, it rotates once per sidereal day (23h 56m). Each sidereal hour, it covers 15° of sky.
About Femtosecond (fs)
Definition
The femtosecond is a unit of time equal to 10⁻¹⁵ seconds — one quadrillionth of a second.
Mathematical Relationship
1 fs = 10⁻¹⁵ s = 0.001 ps = 1,000 as. Light travels about 0.3 µm in one femtosecond.
Conversion Formula
To convert fs to seconds: multiply by 10⁻¹⁵. To convert fs to picoseconds: divide by 1,000.
Practical Applications
LASIK eye surgery uses femtosecond lasers. Also used in precision micro-machining and optical frequency combs.
Interesting Facts
A femtosecond is to one second as one second is to about 31.7 million years. The fastest chemical reactions occur on femtosecond timescales.
Common Mistakes
Confusing femtoseconds with picoseconds. Remember: fs is 1,000× shorter than ps.
Educational Tips
Ahmed Zewail's Nobel-winning work proved we can 'photograph' chemical reactions happening in femtoseconds using ultrafast laser pulses.