It's still using the sun to tell time isn't it?
Planting <http://www.nytimes.com/2015/01/29/garden/planting-a-clock-that-tracks-hours -by-flowers.html?emc=edit_th_20150129&nl=todaysheadlines&nlid=27879023&_r=0> a Clock That Tracks Hours by Flowers Bob
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