Declination = 23.45o PI / 180 Sin[2 PI ((284+n)/365.25)] - where n = day : 1st January n = 1.
The vertical offset to lamp from the model will be: tan (Declination) x horizontal distance to lamp.
For the local time of day the model is simply rotated 15o for each hour from 12 noon (solar time).
For the location the model is tilted to 90o - latitude.