earthkit.meteo.solar.array.cos_solar_zenith_angle
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.. py:function:: earthkit.meteo.solar.array.cos_solar_zenith_angle(date, latitudes, longitudes)

   Cosine of solar zenith angle.

   :param date: Date
   :type date: :class:`datetime.datetime`
   :param latitudes: Latitude [degrees]
   :type latitudes: :class:`array-like`
   :param longitudes: Longitude [degrees]
   :type longitudes: :class:`array-like`

   :returns: Cosine of the solar zenith angle (all values, including negatives)
             [Hogan_and_Hirahara2015]_. See also:
             http://answers.google.com/answers/threadview/id/782886.html
   :rtype: :class:`float array`