@property<EOL><INDENT>def zenith_luminance(self):<DEDENT>
return self._get_data_by_field(<NUM_LIT>)<EOL>
Return annual Zenith Luminance as a Ladybug Data Collection.

        This is the Zenith Illuminance in Cd/m2. (Average amount of luminance at
        the sky's zenith in tens of Cd/m2 during the number of minutes preceding
        the time indicated.) It is not currently used in EnergyPlus calculations.
        It should have a minimum value of 0; missing value for this field is 9999.

        Read more at: https://energyplus.net/sites/all/modules/custom/nrel_custom/pdfs
            /pdfs_v8.4.0/AuxiliaryPrograms.pdf (Chapter 2.9.1)