Optical second
| Optical second (like this the rivet) | |
|---|---|
| Sign | L.S. |
| system | Non SI unit |
| quantity | length |
| Definition | The length where light passes the free space in 1 seconds |
Optical second(Like this the rivet), mainly astronomy distance（ length) unit. "Second" it has been attached, but time.
As for 1 optical second light（ electromagnetic wave) 1 second it is defined. meter the distance where light advances to 1 seconds of 299 792 458 parts it is defined, 1 optical second becomes with 299 792 458 m precisely.
As for optical second light-year. To similar, light 1 hour, the distance which advances to 1 minutesAt the time of light、Optical amountWith it is possible to define. 1 optical time 1 079 252 848 800 m, as for 1 light it becomes with 17 987 547 480 m. In addition, in second prefix meaningOptical microsecond(299.792 458 m),Optical nanosecond(0.299 792 458 m) and the like with it can define also the unit which is said. As for optical microsecond and optical nanosecond etc., electronic engineering.
Case
- earth 0.0425 optical seconds
- Earth month 1.282 optical seconds
- sun approximately 4.643 optical seconds
- Earth sun ( astronomical unit) 499.0 optical seconds = 8.317 lights
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