Difference between revisions of "Template:Comparison satellite navigation orbits"

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[[Image:Comparison_satellite_navigation_orbits.svg|thumb|{{{1|250px}}}|link=http://upload.wikimedia.org/wikipedia/commons/b/b4/Comparison_satellite_navigation_orbits.svg|Comparison of [[Geostationary Earth Orbit|geostationary]], '''[[GPS]]''', '''[[GLONASS]]''', '''[[Galileo_(satellite_navigation)|Galileo]]''', '''[[Compass_navigation_system|Compass (MEO)]]''', [[International Space Station]], [[Hubble Space Telescope]] and [[Iridium constellation]] orbits, with the [[Van Allen radiation belt]]s and the [[Earth]] to scale.<ref group=lower-alpha>Orbital periods and speeds are calculated using the relations 4&pi;&sup2;''R''&sup3;&nbsp;=&nbsp;''T''&sup2;''GM'' and ''V''&sup2;''R''&nbsp;=&nbsp;''GM'', where ''R'' = radius of orbit in metres, ''T'' = orbital period in seconds, ''V'' = orbital speed in m/s, ''G'' = gravitational constant &asymp; 6.673{{e|-11}}&nbsp;Nm&sup2;/kg&sup2;, ''M'' = mass of Earth &asymp; 5.98{{e|24}}&nbsp;kg.</ref> The [[Moon]]'s orbit is around 9 times larger than geostationary orbit.<ref group=lower-alpha>Approximately 8.6 times (in radius and length) when the moon is nearest (363&thinsp;104 km &divide; 42&thinsp;164 km) to 9.6 times when the moon is farthest (405&thinsp;696 km &divide; 42&thinsp;164 km).</ref> (In [http://upload.wikimedia.org/wikipedia/commons/b/b4/Comparison_satellite_navigation_orbits.svg the&nbsp;SVG&nbsp;file,] hover over an orbit or its label to highlight it; click to load its article.)]]<noinclude>{{Template reference list|lower-alpha}}</noinclude>
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[[File:annual_human_migration_world_map.svg|thumb|{{{1|300px}}}|Pictographic world map comparing the largest human migrations<ref>{{cite web|title=Chinese New Year: The World's Largest Human Migration Is About To Begin|first=Niall|last=McCarthy|publisher=Forbes|url=http://forbes.com/sites/niallmccarthy/2018/02/14/chinese-new-year-the-worlds-largest-human-migration-is-about-to-begin-infographic}}</ref>]]

Revision as of 13:33, 15 February 2018

Pictographic world map comparing the largest human migrations[1]
  1. McCarthy, Niall. "Chinese New Year: The World's Largest Human Migration Is About To Begin". Forbes.