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| + | One '''light year''' (abbreviated '''ly''') was a unit of measurement used for establishing distance from one location to another in [[space]]. The length of this unit was standardized by the [[Federation Standards Measurement Bureau|UFP Standards Measurement Bureau]]. Other spacefaring species, such as the [[Sheliak]], had their own unit of distance. ({{TOS|Where No Man Has Gone Before}}; {{TNG|The Ensigns of Command}}) |
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| − | One '''light year''' is the distance that [[light]] travels in one [[Earth]] [[year]]. It is approximately equal to 9.46 {{exp|15}} [[meter]]s, or 5.88 {{exp|12}} [[mile]]s. |
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| + | == Examples == |
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| − | Light years are common units of measurement used in [[starship]] navigation. |
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| + | In the [[Treaty of Armens]] ([[2255]]), it was stipulated, "''Third party assistance may be requested from a Federation Starfleet vessel or a [[Sheliak Corporate]] [[spacecraft]] if the distance from the vessel to the respective [[homeworld]] is greater than five thousand (5.0{{exp|3}}) light years. UFP Standards Measurement Bureau Units. Assistance may also be requested if the vessel is less than 1,000 light years from a standard UFP [[subspace relay station|subspace relay booster station]].''" ({{TNG|The Ensigns of Command}}) |
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| + | |||
| + | When the computer identified the [[numerical sequence]] sent by the [[Borg]] into the [[Delta Quadrant]] in [[2153]], it became [[pulsar frequency|pulsar frequencies]] with [[geometry|geometric]] light year measurements. ({{ENT|Regeneration}}) |
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When [[Commander]] [[Benjamin Sisko]] welcomed the first guest from the [[Gamma Quadrant]] in the [[Alpha Quadrant]], a [[Tosk]], he told him that he traveled almost ninety thousand light years through the [[wormhole]]. ({{DS9|Captive Pursuit}}) |
When [[Commander]] [[Benjamin Sisko]] welcomed the first guest from the [[Gamma Quadrant]] in the [[Alpha Quadrant]], a [[Tosk]], he told him that he traveled almost ninety thousand light years through the [[wormhole]]. ({{DS9|Captive Pursuit}}) |
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The same year, Sisko told [[Kai]] [[Opaka]] that the Gamma Quadrant is seventy thousand light years away from [[Bajor]]. ({{DS9|Battle Lines}}) |
The same year, Sisko told [[Kai]] [[Opaka]] that the Gamma Quadrant is seventy thousand light years away from [[Bajor]]. ({{DS9|Battle Lines}}) |
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| + | == Appendices == |
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=== Related links === |
=== Related links === |
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* [[Astronomical unit]] |
* [[Astronomical unit]] |
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| + | * [[Light day]] |
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* [[Light hour]] |
* [[Light hour]] |
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* [[Parsec]] |
* [[Parsec]] |
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| − | == Background == |
+ | === Background information === |
| − | The exact length of a light year depends on the exact length used for one "Earth year". The {{w|International Astronomical Union|IAU}} uses a {{w|Julian year (astronomy)|Julian year}} of 365.25 days, while other sources may use a {{w|Gregorian calendar|Gregorian year}} of 365.2425 days, or another [[year]] altogether. |
+ | The light year is the distance that [[light]] travels in one [[Earth]] [[year]]. It is approximately equal to 9.46{{exp|12}} [[kilometer]]s, or 5.88{{exp|12}} [[mile]]s.The exact length of a light year depends on the exact length used for one "Earth year". The {{w|International Astronomical Union|IAU}} uses a {{w|Julian year (astronomy)|Julian year}} of 365.25 days, while other sources may use a {{w|Gregorian calendar|Gregorian year}} of 365.2425 days, or another [[year]] altogether. |
{| class="grey" |
{| class="grey" |
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|- |
|- |
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! Source |
! Source |
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! year (days) |
! year (days) |
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| − | ! light year ( |
+ | ! light year (kilometers) |
! light year (miles) |
! light year (miles) |
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|- |
|- |
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| IAU || 365.25 |
| IAU || 365.25 |
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| − | | 9,460,730,472, |
+ | | 9,460,730,472,581 |
| 5,878,625,373,184 |
| 5,878,625,373,184 |
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|- |
|- |
||
| Gregorian || 365.2425 |
| Gregorian || 365.2425 |
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| − | | 9,460,536,207,068 |
+ | | 9,460,536,207,068 |
| 5,878,504,662,190 |
| 5,878,504,662,190 |
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|- |
|- |
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| Google || 365.242199 |
| Google || 365.242199 |
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| − | | 9.460 528 4 |
+ | | 9.460 528 4{{exp|12}} |
| − | | 5.878 499 81 |
+ | | 5.878 499 81{{exp|12}} |
|- |
|- |
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| Yahoo || 365.2411<sup>‡</sup> |
| Yahoo || 365.2411<sup>‡</sup> |
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| − | | 9.460 5 |
+ | | 9.460 5{{exp|12}} |
| 5,878,482,164,161 |
| 5,878,482,164,161 |
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|} |
|} |
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<sup>‡</sup> Note that while Yahoo separately reports a year length of 365.24220 days, its rounding of the light year length to five digits works out to a year length of ~365.2411 days. |
<sup>‡</sup> Note that while Yahoo separately reports a year length of 365.24220 days, its rounding of the light year length to five digits works out to a year length of ~365.2411 days. |
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| − | == External link == |
+ | === External link === |
| − | * {{ |
+ | * {{wikipedia|Light-year|Light year}} |
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[[bg:Светлинна година]] |
[[bg:Светлинна година]] |
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[[ja:光年]] |
[[ja:光年]] |
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[[nl:Lichtjaar]] |
[[nl:Lichtjaar]] |
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| + | [[sr:Свјетлосна година]] |
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| − | [[sr:Svjetlosna godina]] |
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| ⚫ | |||
Revision as of 18:00, 24 January 2016
One light year (abbreviated ly) was a unit of measurement used for establishing distance from one location to another in space. The length of this unit was standardized by the UFP Standards Measurement Bureau. Other spacefaring species, such as the Sheliak, had their own unit of distance. (TOS: "Where No Man Has Gone Before"; TNG: "The Ensigns of Command")
Examples
In the Treaty of Armens (2255), it was stipulated, "Third party assistance may be requested from a Federation Starfleet vessel or a Sheliak Corporate spacecraft if the distance from the vessel to the respective homeworld is greater than five thousand (5.0×103) light years. UFP Standards Measurement Bureau Units. Assistance may also be requested if the vessel is less than 1,000 light years from a standard UFP subspace relay booster station." (TNG: "The Ensigns of Command")
When the computer identified the numerical sequence sent by the Borg into the Delta Quadrant in 2153, it became pulsar frequencies with geometric light year measurements. (ENT: "Regeneration")
When Commander Benjamin Sisko welcomed the first guest from the Gamma Quadrant in the Alpha Quadrant, a Tosk, he told him that he traveled almost ninety thousand light years through the wormhole. (DS9: "Captive Pursuit")
In 2369, a Vanoben transport was raided two light years away from Deep Space 9. (DS9: "Vortex")
The same year, Sisko told Kai Opaka that the Gamma Quadrant is seventy thousand light years away from Bajor. (DS9: "Battle Lines")
Appendices
Related links
Background information
The light year is the distance that light travels in one Earth year. It is approximately equal to 9.46×1012 kilometers, or 5.88×1012 miles.The exact length of a light year depends on the exact length used for one "Earth year". The IAU uses a Julian year of 365.25 days, while other sources may use a Gregorian year of 365.2425 days, or another year altogether.
| Source | year (days) | light year (kilometers) | light year (miles) |
|---|---|---|---|
| IAU | 365.25 | 9,460,730,472,581 | 5,878,625,373,184 |
| Gregorian | 365.2425 | 9,460,536,207,068 | 5,878,504,662,190 |
| 365.242199 | 9.460 528 4×1012 | 5.878 499 81×1012 | |
| Yahoo | 365.2411‡ | 9.460 5×1012 | 5,878,482,164,161 |
‡ Note that while Yahoo separately reports a year length of 365.24220 days, its rounding of the light year length to five digits works out to a year length of ~365.2411 days.