Whenever someone uses words like parsec and light year, it is always necessary to convert it normal SI units before it is understood. Wouldn't it make more sense to state its approximate distance in normal units as 30.9 Pm instead of "trillions of kilometres", when names like trillion have different meanings to different people? Then again, why do we need this nonsense unit when expressing all spacial distances in metres with proper prefixes, such as kilo, mega, giga, tera, peta, exa, zetta, yotta can be used? The Government and BBC would call the above number 19.2 trillion miles - see long scale for further information. Derek Ross | Talk 16:21, 25 November 2004 (UTC) Reply Make that 'Traditional British billion' rather than 'modern British billion'. It would be 19.2 trillion miles in American trillions. If you're talking American billion, then no. contribs) 16:07, 25 November 2004 So if you're talking British billion, yes that's right.Preceding unsigned comment added by 65.35.122.133 ( talk jim foit - Preceding unsigned comment added by 74.77.148.238 ( talk) 14:16, 31 January 2017 (UTC) Reply įor the non-astronomers among us, how many miles is a parsec? From a crossword puzzle clue, I'm guessing 19 billion miles. I feel this is so much cleaner I'm going to put it in. A parsec is the length of that leg when the angle between the Sun and Earth is one arc-second. Imagine being on that point as it moves away causing the angle between the Sun and Earth to decrease. How about this instead: Derivation: create a right triangle with one leg being from the Earth to the Sun and the other leg, the parsec, being from the Sun to a point in space. The derivation of Parsec is wordy and requires people to look up "subtend" to figure out what ur saying. This article has been rated as C-Class on the quality scale. Wikipedia 1.0 Wikipedia:Version 1.0 Editorial Team Template:WP1.0 Version 1.0 articles This article has been reviewed by the Version 1.0 Editorial Team. This article has been rated as Top-importance on the project's importance scale. This article has been rated as B-Class on the project's quality scale. Astronomy Wikipedia:WikiProject Astronomy Template:WikiProject Astronomy Astronomy articles This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia. This article is of interest to the following WikiProjects: This article has been rated as B-Class by WikiProject Vital Articles. Parsec has been listed as a level-4 vital article in Science, Physics. See templates for discussion to help reach a consensus. › ‹ The template below ( Vital article) is being considered for merging.
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