http://en.wikipedia.org/wiki/Analemma
http://en.wikipedia.org/wiki/Equation_of_time which includes figure with animated components
More or less analemma here/later?
Earliest sunset analemmas from http://www.pikespeakphoto.com/winter-analemma.html and http://www.pikespeakphoto.com/analemma.html
Base of earliest sunset diagram from http://www.tommcmahon.net/2006/11/why_the_earlies.html which was from John Holtz