[Slump Tester]

I thought it was neat the way different kinds of lights like mercury vapor vrs. sodium vapor stood out. He described Japan as having a bluish hue, and then later he mentions somewhere else as being blue from mercury vapor lights.

[TChad]

Also there are characteristic patterns: radiating stars for Europe, gridworks for the U.S.

I was surprised that the D.C. diamond was so clearly visible.