Femtosecond to Day (Sidereal) Converter
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How to Convert Femtosecond to Day (Sidereal)
To convert fs to seconds: multiply by 10⁻¹⁵. To convert fs to picoseconds: divide by 1,000.
1 fs = 10⁻¹⁵ s = 0.001 ps = 1,000 as. Light travels about 0.3 µm in one femtosecond.
For example, 1 Femtosecond (fs) = 1.160576e-20 Day (Sidereal) (d (Sid)).
Femtosecond to Day (Sidereal) — Common Values
| Femtosecond (fs) | Day (Sidereal) (d (Sid)) |
|---|---|
| 0.1 | 1.160576e-21 |
| 0.5 | 5.802881e-21 |
| 1 | 1.160576e-20 |
| 2 | 2.321153e-20 |
| 5 | 5.802881e-20 |
| 10 | 1.160576e-19 |
| 25 | 2.901441e-19 |
| 50 | 5.802881e-19 |
| 100 | 1.160576e-18 |
| 500 | 5.802881e-18 |
| 1000 | 1.160576e-17 |
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.
About Day (Sidereal) (d (Sid))
Definition
The sidereal day is the time for Earth to rotate once relative to distant stars — approximately 23 hours, 56 minutes, and 4 seconds (86,164.0905 seconds).
Mathematical Relationship
1 sidereal day ≈ 23 h 56 min 4.09 s = 86,164.09 s. About 3 min 56 s shorter than a solar day.
Conversion Formula
To convert sidereal days to solar days: multiply by 0.99727. To hours: multiply by 23.9345.
Practical Applications
Telescope pointing and tracking, satellite ground track calculations, and astronomical observation scheduling.
Interesting Facts
Because of the ~4-minute difference, the night sky shifts gradually — the same star appears at the same position about 4 minutes earlier each night.
Common Mistakes
Equating sidereal day with solar day. The ~4-minute difference accumulates — after 6 months, sidereal noon is at solar midnight.
Educational Tips
Imagine Earth spinning AND orbiting: after one full spin (sidereal day), Earth has moved in its orbit, so the Sun hasn't quite returned to the same position — that takes ~4 more minutes.