Instant · Precise · Universal
28 units available
6 categories total
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)) = 359017040000 Shake (shake).
| Hour (Sidereal) (h (Sid)) | Shake (shake) |
|---|---|
| 0.1 | 35901704000 |
| 0.5 | 179508520000 |
| 1 | 359017040000 |
| 2 | 718034080000 |
| 5 | 1.795085e+12 |
| 10 | 3.590170e+12 |
| 25 | 8.975426e+12 |
| 50 | 1.795085e+13 |
| 100 | 3.590170e+13 |
| 500 | 1.795085e+14 |
| 1000 | 3.590170e+14 |
The sidereal hour is 1/24 of a sidereal day — approximately 3,590.17 seconds (59 minutes and 50.17 seconds in solar time).
1 sidereal hour = 3,590.17 solar seconds ≈ 59 min 50.17 s in solar time. 24 sidereal hours = 1 sidereal day.
To convert sidereal hours to solar seconds: multiply by 3,590.17. To solar hours: multiply by 0.99727.
Right ascension in celestial coordinates is measured in hours (0–24 h of sidereal time), directly using sidereal hours.
Right ascension is measured in hours: 1 h of RA = 15° of sky. The entire sky is 24 sidereal hours in rotation.
Treating sidereal hours as exactly 60 solar minutes. The ~10-second difference matters for precision tracking.
If you use a star-tracking telescope, it rotates once per sidereal day (23h 56m). Each sidereal hour, it covers 15° of sky.
A shake is an informal unit of time equal to 10 nanoseconds (10⁻⁸ seconds), used in nuclear physics.
1 shake = 10 ns = 10⁻⁸ s = 10,000 ps. A nuclear fission event takes about 1 shake.
To convert shakes to seconds: multiply by 10⁻⁸. To nanoseconds: multiply by 10.
Timing nuclear chain reactions, modeling neutron transport in reactors, and nuclear weapon physics calculations.
In a nuclear explosion, the chain reaction is complete in about 50–60 shakes (500–600 ns). The name reflects the era's dark humor.
Not recognizing 'shake' as a real unit. It's informal but precisely defined and still used in nuclear engineering.
A 'shake' = 10 nanoseconds. It was invented at Los Alamos to make nuclear timing calculations easier — humor in extreme circumstances.



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