Difference between revisions 1952685 and 1965015 on enwikiversity

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Draft:Lofting technology
[[Image:Skylab-73-HC-440HR.jpg|thumb|right|250px|The Saturn V SA-513 lifts off to boost the Skylab Orbital Workshop into Earth orbit on March 14, 1973. Credit: NASA.]]
[[Astronomy]] is performed by location and is subject to local conditions. The shapes and sizes of observatories have changed over time, as have their altitude. The motivations for putting an observatory manned or unmanned at different altitudes has led to a great variety in '''lofting technology'''.
{{clear}}

==Technology==
{{main|Technology}}
'''Def.''' an "organization of knowledge for practical purposes"<ref name=TechnologyWikt>{{ cite book
|author=[[wikt:User:193.219.157.22|193.219.157.22]]
|title=technology
|publisher=Wikimedia Foundation, Inc
|location=San Francisco, California
|date=5 December 2014
|url=https://en.wiktionary.org/wiki/technology
(contracted; show full)
* [[w:Exosphere|Exosphere]] &mdash; Thermosphere to 10,000 km.

==Earth radius==
{{main|Distances/Radius/Earth|Earth radius}}
[[Image:Lowresgh.jpg|thumb|right|400px|The diagram shows variation from the ellipsoid and sea level. Credit: .]]
Because the Earth is not perfectly spherical, no single value serves as its natural radius. Distances from points on the surface to the center range from 6,353 km to 6,384 km. ''Earth radius'' is also used as a unit of distance, especially in 
[[astronomy]] and [[geology]]. It is usually denoted by <math>R_\oplus</math>. Earth's rotation, internal density variations, and external tidal forces cause it to deviate systematically from a perfect sphere.<ref>For details see [[w:Figure of the Earth|Figure of the Earth]], [[w:Geoid|Geoid]], and [[w:Earth tide|Earth tide]].</ref> Local [[w:topography|topography]] increases the variance, resulting in a surface of unlimited complexity. Any radius falls between the polar minimum of about 6,3(contracted; show full)* [http://www.tandfonline.com/ Taylor & Francis Online]
* [http://heasarc.gsfc.nasa.gov/cgi-bin/Tools/convcoord/convcoord.pl Universal coordinate converter]
* [http://www.wikidoc.org/index.php/Main_Page WikiDoc The Living Textbook of Medicine]
* [http://onlinelibrary.wiley.com/advanced/search Wiley Online Library Advanced Search]
* [http://search.yahoo.com/web/advanced Yahoo Advanced Web Search]

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