At some point in life, almost every child on Earth asks, Why is the sky blue?
But it took a long time for scientists to figure that out.
A modern cyanometer in Ljubljana, Slovenia.
The cyanometer also periodically photographs the sky and sends the photos back to the online archive.
The cyanometer is completely energy self-sufficient, since it runs on solar energy.
De Saussures original cyanometer.
Photo credit:Kirsten Carlson
Photo credit:artecitya.eu
Source:Slovenia Times/Wikipedia/math.ucr.edu/PubMed
