Light hour: Difference between revisions
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Similar units are the [[light second]], [[light minute]], [[light day]], [[light week]], [[light month]], [[light year]]. | Similar units are the [[light second]], [[light minute]], [[light day]], [[light week]], [[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. | 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 [[hour]] = 60 [[minutes]] = 3600 [[seconds]] | * 1 [[hour]] = 60 [[minutes]] = 3600 [[seconds]] | ||
* 1 light hour = 1.0792528 * 10<sup>12</sup>m | * 1 light hour = 1,079,252,848,800 m = 1.0792528 * 10<sup>12</sup>m | ||
===Comparison to other Units=== | ===Comparison to other Units=== | ||
* 1 [[astronomical unit| AU]] = 0. | * 1 [[astronomical unit| AU]] = 0.14 light hours | ||
* 1 light hour = 1,079,252, | * 1 light hour = 1,079,252,848.800 [[km]] | ||
* 1 light hour = | * 1 light hour = 638,481,190.100 [[mi]]<ref>1 mi = 1609.344 m</ref> | ||
* 1 light hour = | * 1 light hour = 3,540,855,803,149.606 [[ft]]<ref> 1 ft = 0.3048 m</ref> = 3.5408558 * 10<sump>12</sup> [[ft]] | ||
* 1 light hour = 1. | * 1 light hour = 1,180,285,267,716.535 [[yd]] <ref> 1 yd = 0.9144 m</ref> = 1.1802853 * 10<sup>12</sup> [[yd]] | ||
===Distances in Light | ===Distances in Light hours<ref>Joachim Hermann, Großes Lexikon der Astronomie, Bertelsmann Club GmbH, 00541 3</ref>=== | ||
* the average distance between [[earth]] and [[sun]] is about | * the average distance between [[sun]] and [[Merkur]] is about 57.9 Mio km or 0.05 light hours | ||
* the average distance between [[sun]] and [[Venus]] is about 108.2 Mio km or 0.10 light hours | |||
* the average distance between [[sun]] and [[earth]] is about 149.6 Mio km or 0.14 light hours | |||
* the average distance between [[sun]] and [[Mars]] is about 227.9 Mio km or 0.21 light hours | |||
* the average distance between [[sun]] and [[Jupiter]] is about 778 Mio km or 0.72 light hours | |||
* the average distance between [[sun]] and [[Saturn]] is about 1427 Mio km or 1.32 light hours | |||
* the average distance between [[sun]] and [[Uranus]] is about 2870 Mio km or 2.66 light hours | |||
* the average distance between [[sun]] and [[Neptun]] is about 4496 Mio km or 4.17 light hours | |||
* the average distance between [[sun]] and [[Pluto]] is about 5946 Mio km or 5.51 light hours | |||
===Notes=== | |||
<div class="references-2column"> | |||
<references /> | |||
</div> | |||
===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 hour]] | [[Category:CZ Live|Light hour]] | ||
[[Category:Astronomy Workgroup|Light hour]] | [[Category:Astronomy Workgroup|Light hour]] | ||
Revision as of 11:58, 9 October 2007
The light hour is the distance that the light travels in vacuum in one hour and so is a unit of distance.
Similar units are the light second, light minute, light day, light week, 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 hour = 60 minutes = 3600 seconds
- 1 light hour = 1,079,252,848,800 m = 1.0792528 * 1012m
Comparison to other Units
- 1 AU = 0.14 light hours
- 1 light hour = 1,079,252,848.800 km
- 1 light hour = 638,481,190.100 mi[2]
- 1 light hour = 3,540,855,803,149.606 ft[3] = 3.5408558 * 10<sump>12 ft
- 1 light hour = 1,180,285,267,716.535 yd [4] = 1.1802853 * 1012 yd
Distances in Light hours[5]
- the average distance between sun and Merkur is about 57.9 Mio km or 0.05 light hours
- the average distance between sun and Venus is about 108.2 Mio km or 0.10 light hours
- the average distance between sun and earth is about 149.6 Mio km or 0.14 light hours
- the average distance between sun and Mars is about 227.9 Mio km or 0.21 light hours
- the average distance between sun and Jupiter is about 778 Mio km or 0.72 light hours
- the average distance between sun and Saturn is about 1427 Mio km or 1.32 light hours
- the average distance between sun and Uranus is about 2870 Mio km or 2.66 light hours
- the average distance between sun and Neptun is about 4496 Mio km or 4.17 light hours
- the average distance between sun and Pluto is about 5946 Mio km or 5.51 light hours
Notes