Difference between revisions 931274 and 932721 on enwikiversity

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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'''.
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|title=''What is "Mean Sea Level"?''
|publisher=Proudman Oceanographic Laboratory }}</ref> MSL also plays an extremely important role in [[w:aviation|aviation]], where standard sea level pressure is used as the measurement datum of altitude at [[w:flight level|flight level]]s.”

==Atmosphere==

'''Def.''' "a layer of [[w:Gas|gases]] that may surround a material body of sufficient [[w:Mass|mass]],<ref name=Ontario>{{ cite web
|url=
http://www.ontariosciencecentre.ca/school/clc/visits/glossary.asp
|title=Ontario Science Centre website }}</ref> and that is held in place by the [[w:gravity|gravity]] of the body", per the Wikipedia article [[w:Atmosphere|atmosphere]], is called an '''atmosphere'''.

'''Def.''' "[t]he [[wikt:gas|gases]] surrounding the [[Earth]] or any [[wikt:astronomical|astronomical]] body", per Wiktionary [[wikt:atmosphere|atmosphere]], is called an '''atmosphere'''.

(contracted; show full)[[Category:History of science]]
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