Not for scientific use The values are in different units and the been converted to make them roughly comparable. The solar radiation value was converted from watt/m² to kJ/m² and the predicted radiation was converted from megaJ/m² to kJ/m² per: “converstion info:http://rredc.nrel.gov/solar/pubs/SBF/b.html . The predicted values maybe off by one hour due to DST (daylights savings time).