Haze-SPAN: Haze Sun Photometer Atmospheric Network
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Fig 6. If the Sun is straight over your head, its rays pass through one thickness of the Earth's atmosphere, or one air mass (m). As the Sun's angle over the horizon decreases, the Sun's rays travel through progressively more atmosphere, and m increases.

Fig. 6, Calibrating Data

TERC VHS-1 Sun Photometer: [ Figures and Illustrations Index ] [ Manual TOC ]

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