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Weather Data - Sky Illuminance Daylight

How i can see the detail calculation of my Weather data? In my thesis, i want to get the Daylight factor that i can get from the ratio Illuminance Indoor and Sky Illuminance. So the OpenStudio Radiance can do the calculation that the output is Illuminance, but i need do manually calculation to get Daylight Factor. How i know, the Sky Illuminance Value of my Weather Data that i used to the simulation? or all the detail data.

This is my Weather Data https://www.dropbox.com/s/jk58k78gi134hgc/IDN_Surakarta_MN6.zip?dl=0

Weather Data - Sky Illuminance Daylight

How i can see the detail calculation of my Weather data? In my thesis, i want to get the Daylight factor that i can get from the ratio Illuminance Indoor and Sky Illuminance. So the OpenStudio Radiance can do the calculation that the output is Illuminance, but i need do manually calculation to get Daylight Factor. How i know, the Sky Illuminance Value of my Weather Data that i used to the simulation? or all the detail data.

This is my Weather Data https://www.dropbox.com/s/jk58k78gi134hgc/IDN_Surakarta_MN6.zip?dl=0

Weather Data - Sky Illuminance Daylight

How i can see the detail calculation of my Weather data? In my thesis, i want to get the Daylight factor that i can get from the ratio Illuminance Indoor and Sky Illuminance. So the OpenStudio Radiance can do the calculation that the output is Illuminance, but i need do manually calculation to get Daylight Factor. How i know, the Sky Illuminance Value of my Weather Data that i used to the simulation? or all the detail data.

This is my Weather Data https://www.dropbox.com/s/jk58k78gi134hgc/IDN_Surakarta_MN6.zip?dl=0