Can cosine of solar zenith angle be negative?

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S J Malik Popular answer

Interesting question

S J Malik

Karl Prodinger

Yes. cos 0° = 1, cos 90° = 0. More than 90° will be negative.

Kurt Klingbeil

I am curious about the relevance of the terrain angle ?

In cases of calculation of the effects of albedo from snow-covered slopes the angle of the terrain/snow surface could be relevant