Editing Parsec

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A [[Parsec]] is a unit of length used to measure the distance between [[star]]s. 
* It is an [[Astrography|astrographic]] scale measurement.
* It is a standard [[Third Imperium|Imperial]] [[metric]].
[[File: Technical Data.jpg|right]]

=== Library Data Referral Tree ===
Please refer to the following [[AAB]] [[Library Data]] for more information: <br>
'''[[Starship]]:''' 
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== Description ([[Specifications]]) ==
The name ''parsec'' stands for "parallax of one second of arc", and allows calculating distances to nearby [[star]]s using simple observation and trigonometric parallax (apparent motion of an object due to change of position of the observer). It is one of the oldest [[Terra (world)|Terran]] methods for measuring the distances to [[star]]s.
* A parsec is based on a baseline of 1 [[Astronomical Unit]].
* The standard imperial abbreviation is ''[[pc]]''.

=== Image Repository ===
[[File:Parsec Diagram.jpg]]

=== Equivalent Metrics ===
Other cultures have different values for a parsec:
* The [[Deshi]] is a [[Vilani]] equivalent to the parsec.

=== Term Usage Example ===
The [[Third Imperium|Imperial]] [[world]] of [[Regina (world)|Regina]] lies approximately one parsec from the [[non-aligned]] [[Ruie (world)|Ruie]] [[system]].

== History & Background ([[Dossier]]) ==
The [[Solomani]] define one parsec to be the distance from [[Terra]] to a star that has a parallax of 1 arcsecond, and equals 3.261 [[light-year]]s or 206,265 [[Astronomical Unit]]s. 

Modern [[Third Imperium|Imperial]] usage bases the parsec on the value of pi times [[light-year]]s (one parsec is equal to 3.142 [[light-year]]s){{Unpublished cite|author= [[Marc Miller]], September 2018 }}. This is equivalent to a distance of 198,738 [[Astronomical Unit]]s, although for convenience and simplicity this value is generally rounded to 200,000 [[Astronomical Unit|AU]]. The concept was adopted following the [[Solomani Rim War]] to avoid the use of specifically Terranocentric [[metric]]s.{{Unpublished cite|author= [[Ade Stewart]] }}  
* By coincidence this distance is very close to the maximum distance a Jump-1 [[drive]] can jump. 
* Because of this, 'parsec' has become the standard word used for this distance within the {{Imperium}}. 
* Other races, using the orbital distance of their [[home world]] and different definitions of an arc second would derive different values for a parsec, but these wouldn't be Imperial parsecs.

== References & Contributors ([[Sources]]) ==
{{Metadata}}
{{Wikipedia|Parsec}}
{{Advanced}}
{{Sources
|S1= {{Ludography cite|name= T5 Core Rules |page=615}}
|S2= [[Traveller Wiki Editorial Team]]
|S3= Author & Contributor: [[User:WHULorigan|WHULorigan]]
|S4= Author & Contributor: Lord (Marquis) and Master Scout Emeritus [[Adie Alegoric Stewart]] of the [[IISS]]
|S5= Author & Contributor: Lord (Marquis) and Master of Sophontology [[Maksim-Smelchak]] of the [[Ministry of Science]] 
}}
 

{{DE|Astrography|Metric|}}
{{LEN|Solomani}}