[zie]

You would need to have the data of how high the sun is in the sky, plus to be accurate you would need to have cloud data as well.

[smackay]

This https://www.timeanddate.com/astronomy/different-types-twilig... is probably a good approximation.

[joeyrobert]

I'm thinking more of an Irradiance map where the value is the current W/m^2 at a specific location, which would take into account latitude and time of year (to get the angle of the Earth relative to the sun), along with other factors like clouds, altitude.

e.g. https://www.nrel.gov/gis/images/solar/solar_ghi_2018_usa_sca... but on the daily.

[palerdot]

As a start, it will be nice to just show the relative intensity of the light ignoring clouds and stuffs ... for example, people should know early morning, mid day and evening from the map which helps which part of the globe is going to get active/inactive