Light week: Difference between revisions
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The '''light week''' is the distance that the [[light]] travels in [[vacuum]] in one [[week]] and so is a unit of distance. | The '''light week''' is the distance that the [[light]] travels in [[vacuum]] in one [[week]] and so is a unit of distance. | ||
Similar units are the [[light second]], [[light minute]], [[light hour]], [[light day]], [[light month]], [[light year]]. | Similar units are the [[light second]], [[light minute]], [[light hour]], [[light day]], [[light month]], [[light year]]. | ||
===numerical value=== | ===numerical value=== | ||
As opposed to the [[light year]], whose value more or less depends on the definition of [[year]], the value of the light hour is defined exactly. | As opposed to the [[light year]], whose value more or less depends on the definition of [[year]], the value of the light hour is defined exactly. | ||
* [[velocity]] of [[light]] in [[vacuum]]: | * [[velocity]] of [[light]] in [[vacuum]]: 299,792,458 m/s <ref>Review of Particle Physics | ||
[http://stacks.iop.org/JPhysG/33/1 Particle Data Group: W.-M. Yao ''et al.'', J. Phys. G 33, 1 (2006).]</ref> ([[meter]]s/[[second]]) | |||
* 1 [[week] = 7 [[days]] = 168 [[hours]] = 10080 [[minutes]] = 604800 [[seconds]] | * 1 [[week] = 7 [[days]] = 168 [[hours]] = 10080 [[minutes]] = 604800 [[seconds]] | ||
* 1 light | * 1 light week = 181,314,478,598,400 m = 1.8131448 * 10<sup>14</sup>m | ||
===Comparison to other Units=== | ===Comparison to other Units=== | ||
* 1 light week = | * 1 light week = 181,314,478,598.400 [[km]] = 1.8131448 * 10<sup>11</sup> [[km]] | ||
* 1 light week = 1.1266359 * 10<sup>11</sup> [[mi]] | * 1 light week = 112,663,593,736.578 [[mi]] <ref>1 mi = 1609.344 m</ref> = 1.1266359 * 10<sup>11</sup> [[mi]] | ||
* 1 light week = 1. | * 1 light week = 594,863,774,929,133.858 [[ft]]<ref> 1 ft = 0.3048 m</ref> = 5.9486377 * 10<sup>14</sup> [[ft]] | ||
* 1 light week = 1.9828611 * 10<sup>14</sup> [[yd]] | * 1 light week = 198,287,924,976,377.952 [[yd]] <ref> 1 yd = 0.9144 m</ref> = 1.9828611 * 10<sup>14</sup> [[yd]] | ||
===Distances in Light weeks=== | |||
Unfortunately there are no distances in nature where it make sense to express them in light weeks. Distances in our solar system are normally expressed in [[light second]]s up to [[light hour]]s. Distances in our galaxy are normally expressed in [[light year]]s. | |||
===Notes=== | |||
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=== | ===External links=== | ||
* [http://pdg.lbl.gov Particle Data Group & WWW edition of ''Review of Particle Physics''] | |||
* [http://stacks.iop.org/JPhysG/33/1 2006 ''Review of Particle Physics'' in printed layout] | |||
[[Category:CZ Live|Light week]] | [[Category:CZ Live|Light week]] | ||
[[Category:Astronomy Workgroup|Light week]] | [[Category:Astronomy Workgroup|Light week]] | ||
Revision as of 11:59, 12 October 2007
The light week is the distance that the light travels in vacuum in one week and so is a unit of distance.
Similar units are the light second, light minute, light hour, light day, light month, light year.
numerical value
As opposed to the light year, whose value more or less depends on the definition of year, the value of the light hour is defined exactly.
- velocity of light in vacuum: 299,792,458 m/s [1] (meters/second)
- 1 [[week] = 7 days = 168 hours = 10080 minutes = 604800 seconds
- 1 light week = 181,314,478,598,400 m = 1.8131448 * 1014m
Comparison to other Units
- 1 light week = 181,314,478,598.400 km = 1.8131448 * 1011 km
- 1 light week = 112,663,593,736.578 mi [2] = 1.1266359 * 1011 mi
- 1 light week = 594,863,774,929,133.858 ft[3] = 5.9486377 * 1014 ft
- 1 light week = 198,287,924,976,377.952 yd [4] = 1.9828611 * 1014 yd
Distances in Light weeks
Unfortunately there are no distances in nature where it make sense to express them in light weeks. Distances in our solar system are normally expressed in light seconds up to light hours. Distances in our galaxy are normally expressed in light years.
Notes
- ↑ Review of Particle Physics Particle Data Group: W.-M. Yao et al., J. Phys. G 33, 1 (2006).
- ↑ 1 mi = 1609.344 m
- ↑ 1 ft = 0.3048 m
- ↑ 1 yd = 0.9144 m