Light day: Difference between revisions
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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]]: 299,792,458 m/s <ref>Review of Particle Physics | * [[Velocity]] of [[light]] in a [[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]]) | [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 [[day]] = 24 [[hour]] = 1440 [[minutes]] = 86400 [[seconds]] | * 1 [[day]] = 24 [[hour]] = 1440 [[minutes]] = 86400 [[seconds]] | ||
* 1 light day = 25,902,068,371,200 m = 2.5902067 * 10<sup>13</sup>m | * 1 light day = 25,902,068,371,200 m = 2.5902067 * 10<sup>13</sup>m | ||
===Comparison to other units=== | ===Comparison to other units=== | ||
Revision as of 00:13, 7 December 2008
A light day is the distance that light travels in a vacuum in one day (thus a unit of distance, not time). Similarly, there are the light second, light minute, light hour, light week, light month and 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 a vacuum: 299,792,458 m/s [1] (meters/second)
- 1 day = 24 hour = 1440 minutes = 86400 seconds
- 1 light day = 25,902,068,371,200 m = 2.5902067 * 1013m
Comparison to other units
- 1 light day = 25,902,068,371.200 km = 2.5902068 * 1010 km
- 1 light day = 16,094,799,105.225 mi[2] = 1.6094799 * 1010 mi
- 1 light day = 84,980,539,275,590.551 ft[3] = 8.498053913 ft
- 1 light day = 28,326,846,425,196.850 yd [4] = 2.8326846 * 1013 yd