Orbits of Mars and Earth seen from the north. Also shows lengths of seasons, equinoxes, solstices, perihelion and aphelion.
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References:
</p><p><a rel="nofollow" class="external free" href="http://www.giss.nasa.gov/tools/mars24/">http://www.giss.nasa.gov/tools/mars24/</a>
</p><p><a rel="nofollow" class="external free" href="http://www.planetary.org/explore/topics/mars/calendar.html">http://www.planetary.org/explore/topics/mars/calendar.html</a>
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<a rel="nofollow" class="external free" href="http://www-mars.lmd.jussieu.fr/mars/time/solar_longitude.html">http://www-mars.lmd.jussieu.fr/mars/time/solar_longitude.html</a>
<a href="//commons.wikimedia.org/wiki/User:Areong" title="User:Areong">Areong</a>
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<span class="int-own-work" lang="en">Own work</span>