I've had a rough idea of Mars' retrograde movement and how it works in relation to the Earth's orbit, but only with this article did it become clear thanks to the wonderful animation and concise description. Important to know in geek astronomy circles .... or is that geek astronomy orbits?
Many genealogical journeys begin with story outlines and faint ideas or remembrances of family oral history. Most family trees have branches that end up as timbers in the wharf at some port of entry. What lies beyond ocean's edge?
Get rid of the portable USB drives, sneaker-net, emailing files, and constantly being out-of-synch..... get free DROP BOX and experience freedom.
~jfc~
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