I love this graph.
It's from JUPOS, a crowd-sourced
astronomy program to track atmospheric features on Jupiter. Specifically it's
a graph of the width and center of the Great
Red Spot since 2010, taken from observations from
hundreds of astronomers.
The project was started
in 1975 by an East German astronomer. Over time they've collected
historical
data back to 1785 and built a network of observers
using webcams (!)
to take pictures of Jupiter. This graph is a quick view of a
well known feature, they also track much more
detailed numerical data about Jupiter's atmosphere.
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