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2 results for “observation”.

• Reading Earth at Night — What City Lights Reveal About Us
  From orbit, darkness is not empty. Night-light imagery shows where people live, how borders really work, when festivals happen and how much of the sky we have lost — and one satellite band has been measuring it all, night after night.
• A Field Guide to Cloud Species: Ten Forms and What Each One Promises
  You already read the sky a little — most of us do. This guide names ten cloud forms precisely, explains what each says about the air above you, and turns "it looks cloudy" into a forecast you can make yourself.