Fig 9. Graph of the Langley test data in Fig. 8 out to m=9.67. Notice that a line is drawn through the points would be very nearly straight.
First Langley Plot of TERC VHS-1 Sun Photometer
9 March 1996, Seguin, Texas USA (29.6N 97.9W)
Sky: Deep blue; relative humidity: 9%
Observer: Forrest M. Mims III (SPAN)
TERC VHS-1 Sun Photometer:
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