For Option 2 (Simulation) is it accepted to run the simulation for 9.00 and 15.00 on September 21 only, or should it be repeated for March 21st and get the average of both? At page 730 of the Reference Guide it is stated that … “Perform one illuminance simulation at 9 A.M. on the equinox (September 21 or March 21). -•• Perform a second illuminance simulation at 3 P.M. on the equinox (September 21 or March 21)”, which means that the use only one of the spring or autumn equinox is needed. However, Figure 2 at page 733 refers to diffuse and direct horizontal radiation inputs for a sample weather file. How is this used with a local weather file which has been generated from specific meteorological data? Please note that we are using Ecotect with Radiance.